Good morning. Sid Lowe will be online from 11am to take part in a live webchat.
There are no English clubs in the last eight of the Champions League, but the quarter-finals should throw up some fascinating ties.
Here is the draw for this week's first legs:
Bayern Munich v Juventus (Tuesday)
Paris Saint-Germain v Barcelona (Tuesday)
Málaga v Borussia Dortmund (Wednesday)
Real Madrid v Galatasaray (Wednesday)
If you have any questions for Sid, drop them into the comments section below.
Wilsbowski asks: "Any thoughts on Málaga v Dortmund?"
My thoughts on Málaga: this is an impressive achievement but I don't expect them to get through this time. Pellergini was talking about them not conceding in the first game and being "balanced" so on the face of it at least I expect them to be cautious in the first leg.
I think that the romanticism of what Malaga have done has been overplayed a bit but it is a fantastic achievement. Pellegrini is the first coach to take two debutant teams to the quarter-finals.
For some more on Málaga, click here.
MrMondypops asks: "Any chance there will be three Spanish teams in the semi-finals?"
I'd say a very good chance of there being two. The third, Málaga, have it though.
Vkmagus asks: "How do you rate the chances of PSG and Dortmund? Something tells me this will be the year of the underdog and that only one of Real and Barca will make it to last four."
PSG strike ma as a very strange team, although in a sense they are logical, consistent with the way that they have been constructed. It's almost 4-2-4, with a huge hole in the midfield, especially on either side. But they have talent and, against Barcelona, height. Zlatan's inclusion could be significant.
As for Dortmund: they're the team that I have most enjoyed watching in the Champions League this season. They are able to mix it up, and are very athletic, clever and intense.
Gaitlinger10 asks: "What do you think about the contrast between Pedro's performances for Spain and Barcelona? Are Barcelona wasting Pedro's attacking attributes in favour of some defensive work?"
Pedro's pressing is still vital for Barcelona in my opinion. I also don't see it necessarily as a systematic difference between FCB and Spain where his role is concerned. The movement and intention is broadly the same, from his point of view. What's different is the environment. Not just the absence of Messi but the fact that Iniesta is higher for the national team, that there are two deeper midfielders not one, etc. I don't think his attacking abilities are being wasted, at least not in terms of intent. I think it's a bit more circumstantial than it looks.
Maiki asks: "Sid, how would you describe the strength in depth of La Liga, bearing in mind that there are three quarter-finalists here, but Barça are so far ahead that they have already qualified for Champions 2013-14?"
This is a complex question and one that I've dealt with a lot in articles over the last few years. It's also an important question. Another point to throw in: Spain's relative failure in Europa League this year. A competition that last year they had two finalists in, of course.
The key point is that sometimes apparent trends are not as revealing as they may appear. But some points: RM and FCB are probably the most powerful (best?) teams in Europe, not just Spain. For the others in Spain, it is impossible to compete with them. Would it be possible if they were playing in Premier League?
Also, other teams are not rubbish just because big two are so dominant. But they are being slowly strangled to death. Spanish club football is being destroyed. And doing well in Europe or doing badly in Europe does not change the very, very serious structural problems Spanish football has.
Vnk_man asks: "Who will play at left-back for Barcelona? And any ideas on which goalkeeper/centre-back they will sign in the summer?"
Jordi Alba is fit. They want a centre-back, some talk of Hummels but honestly, at this stage, I don't know. Signing Song was a fiasco. Awful.
NedvedMessi asks: "Sid, do you know anything about the condition of the pitch? I guess we can assume it will be at least as bad as San Siro..."
I saw a stand up pitchside on telly earlier and it looked very dry but I don't know. At Stade de France it was bad, apparently. Which doesn't necessarily mean it will be at Parc des Princes of course.
Flake asks: "Any rumblings at Barça around Cesc/Alexis? Neither seem to have added very much to the team and, in the case of the former, on occasion can be said to actually make them worse."
FCB will look for a solution on Alexis and, if there is a good offer, they will consider it for sure. Cesc is a different issue: there is still a belief that they can find his best role and, don't forget, the transition to the post-Xavi era has to start now.
Figbat asks: "After the last round, when Barcelona got off to a terrible start by losing in Milan, is there now a real determination around the camp to not let the same thing happen again? Do they feel that a different approach is needed in Paris or do they feel that their philosophy will win through regardless?"
They feel that the philosophy has been reinforced by the second leg but that the first leg showed that it has to be applied with intensity and aggression. Yes, that game has increased a determination not to let it happen again.
Fotobirajesh asks: "When will UEFA decide to have two quarter final matches at different dates or times? It is difficult, when you have a PSG-Barca and Bayern-Juventus happening at the same time. Having some CL matches in January might help them to reorganise their schedules?"
It's a pity, yes. They did split the last round and that didn't quite work because it felt disjointed and stretched out: too long between first and second legs. Also, having all games at same time does increase the sense of collective experience, eclipsing all else. Even if it does mean you can't watch both games live, of course.
Ihwright asks: "I know the prevailing narrative is that Mourinho eventually wants to manage at Old Trafford and so, regardless of what happens with Mancini, he wouldn't take the City job. But does the presence of Soriano and Begiristain at the Ethiad mean that he might be thought of as being less desirable an option by the club? Were either of them part of the recruiting team who decided that he wasn't the man for Barcelona?"
Yes. They were both involved in his potential signing for Barcelona and thus the decision not to sign him. I think that does make him going to City more difficult yes. I think he'll probably end up at Chelsea this summer.
DougieWright asks: "Does the result in the first leg at Parc de Princes really matter? We've already seen Barcelona comprehensively beaten in Milan in the previous round, before suddenly upping their game for the return leg and becoming unplayable. Also, what impact will Vilanova's return have on the team?"
Yes, I think it matters. Another 4-0 is not very likely. Against Milan, let's not forget, they were a solitary goal from going out – and Milan had two chances. Only two, but it could have shifted there.
Affirmative asks: "What does the Barca squad lack that they will want next season? Yaya Touré? A striker to take some of the burden off Messi? Why did they not sign Llorente?"
Yaya Toure is far too expensive and, with Busquets there, they don't see the need (personally, I think he'd be brilliant. I don't think Pep Guardiola will necessarily turn up at Bayern and start signing Spanish players. To start with I think he'll be quite cautious on that score.
Lowercaseluke asks: "How mush of an advantage is Ibrahimovic's strength and height, given that he will be playing against a Barcelona defence that won't even try to compete aerially and will instead look to win fouls against him every time he jumps?"
Corners, free kicks, isolated moments that maybe don't change flow of a game but can chance its outcome. I think the potential is for his presence to be huge. Barcelona only have Piqué and Busquets over six foot and Busquets not by much
Aidan Culley "Juventus are 14/1 to win the competition. Are they worth a cheeky flutter or can you not see past Barca, Real Madrid and Bayern?"
Looking at Juventus, it's hard not to wonder what might have been if they had been able to sign Llorente now instead of having to wait until next year. Can they win tournament? Yes. Will they? Hard to see. As for candidates: I'm taking Dortmund seriously.
Hardy1610 asks: "Over the years a lot of Brazilians have cut their European footballing teeth in Portugal before moving on to the bigger European clubs, as the country has the same language, easier culture to get used to and so on and helps with the transition to Europe. Is it the same in Spain and are there any particular Latin or South American countries that are linked with particular clubs?"
Looking back over Spanish football history, there is, naturally, a huge percentage of Argentinian players. As you say, that's logical: culturally, linguitsically, economically. Spain had a huge scandal with the 'oriundos' during the period when foreign players were banned but those with Spanish roots were allowed. Basically, lots of Latin Americans invented Spanish parentage to justify coming.
Statistics gathered by a Barcelona lawyer at the time (1970s) showed that something like three quarters were here on false papers. But even that fits the logical dynamic: to make that case is easier from Latin America, where there were historically lots of Spaniards for political, economic, social reasons.
Edevhort asks: "Do you think Juve's defensive tactics will be found out, and will they receive a suitable refereeing response any time soon?"
This is an issue that may become important at some stage but at the moment it's overlooked – how easily refs blow for fouls against attacking players, how hard it seems to be for them to blow for fouls by defenders!
Gileconomicus asks: "Who has been the most impressive player until now in Champions League? My shortlist would include Marco Reus, Burak Yilmaz and Isco. Also, which team are you missing at this stage of the competition?"
Reus is superb to watch, great fun. I'd have liked to see Chelsea here playing with the front three behind a striker. But actually, I really quite like this quarter-final line-up, but for the absence of English teams.
BobbyWestside asks: "Do Galatasaray have the ability to upset Real Madrid?"
I find Galatasary very interesting, not least because they keep saying they won't change their style and that they will atttack Madrid. I'm not sure if that is the best way to go about it – it tends to be heavily punished. But sitting deep is not a guarantee either. I'm interested to see how they do it; the switch from 442 to 4312 has worked up to a point. I wonder if it will now.
Casey Moore asks: "Who has been your standout player thus far – and is Isco the real deal or a flash-in-the-pan type player?"
Isco could be the real thing.
For goals and, to some extent, surprise, Burak is a good shout for standout player. But, of course, it's hard to look beyond Ronaldo and Messi (although their tournaments haven't maybe been as consistently good as they would like yet) ... and I've loved watching Dortmund.
Odn1 asks: "Do you think Neymar is coming in the summer and, if so, will he be another Alexis Sanchez? Also how good do you think Deulofeu will be?"
Deulofeu is an incredible talent, but there are hints that he's a difficult character.
Neymar will come, yes. My small doubt is whther it will be this summer. My big doubt is whether it is such a good idea, but we'll see. I can't claim to have seen that much of him.
BDSMXXXpert asks: "What do you think of Valencia's run this season. Is Valverde slowly turning things on in Europe?"
I think we saw the reality of Valencia: just not quite good enough. A good side but with the best players, the real talents, having been stripped away. they gave it a go up to a point but I actually felt they lacked that little bit of aggression and belief that they could really do it. Valverde is a good coach but they are a club that is being weakened consistently. I am not convinced that the problem of the oter Spanish teams is mental.
Oldspanishgit asks: "Will Mourinho stay on if Madrid do not win the trophy? How important is it that there no English clubs left?"
I think the only thing that makes Mourinho stay is the lack of exit strategies that convince him, but do not think that will be a problem. I suspect he'll end up at Chelsea.
Dominicg asks: "What do you think of the chances of Abidal returning to a regular place in the first team, and Tito being fit and well enough to sustain the pressures that took their toll on Pep?"
I don't know on Tito but in theory at least Abidal is not far off being able to play a part. And, beyond the health issues and the emotional ones, he is very important to them in footballing terms.
Thesixteenthbeatle asks: "Is there any truth that Thiago Alcantara wants to leave Barca this Summer and is he the new Xavi?"
His dad says that he wants him to play. And of course he is entitled to feel like he needs to play more. He's right, in fact. But he would be costly and he would have to push for it. Deep down, I'm not convinced that's in his interests. But he would certainly think carefully about the next step. He would have suitors.
SamM84 asks: "If we were to have another clásico semi-final, how damaging could this be to the Spain squad if rumours about the Alonso and Arbeloa divisions are true, given that a home and away double header would likely be much more heated than a final at Wembley?"
It was a serious problem, then it got overcome to some extent. Now, on a more individualised level, it is a problem again. Another clásico could be damaging, yes. With Arbeloa, Del Bosque has solutions: Dave, for a start. But Alonso is a difficult one. He could revert to the Barcelona midfield.
Some of the stuff swirling round the national team is fascinating, and also unpleasant. The shift in identification is an interesting process.
Gus_Harris asks: "Do you expect David Villa to start for Barcelona tonight? And who do you think will start up front for Real Madrid?"
Villa will play. I imagine as left of front three. Nominally at least.
Benzema and Higuaín is an issue that is difficult for Madrid. Personally, I think Mourinho has got it wrong. Above all, the players have not responded that well. Benzema, particularly. But he has a very good Champions League record. Madrid have become a bit reliant on CR's goals but not really on his play so I still think that have the variety necessary to progress.
Thanks for all your comments and questions. Sid has signed off.
For more Champions League coverage, check out Jacob Steinberg's preview of Bayern Munich v Juventus and Marcus Christenson's preview of PSG v Barcelona.