11.40am: Good morning. Barney Ronay will be online from midday to take part in a live webchat. If you have any questions about this week's fixtures in the Champions League, drop them into the comments section below.

Barney is in Istanbul to cover Manchester United's trip to Galatasaray. This visit should prove less fiery than the clubs' not so forgotten encounter in 1993, when United were out of their depth on the pitch and subjected to terrifying hostility and harassment off it. Let's hope Barney survives his trip to hell. Here is the full fixture list:

Tuesday
Juventus v Chelsea
Nordsjaelland v Shakhtar Donetsk
BATE Borisov v Lille
Valencia v Bayern Munich
Spartak Moscow v Barcelona
Benfica v Celtic
CFR Cluj-Napoca v Braga
Galatasaray v Manchester United

Wednesday
Dynamo Kiev v Paris SG
FC Porto v Din Zagreb
Arsenal v Montpellier
Schalke 04 v Olympiakos
Zenit St P'sbg v Malaga
Anderlecht v AC Milan
Ajax v Borussia Dortmund
Manchester City v Real Madrid

If you have any questions for Barney about Galatasaray v Manchester United or the other games in the Champions League this week, drop them into the comments section below.

12.08pm: Barney Ronay is online answering your questions. EminEmma29 starts us off with a question about Chelsea: "I am really looking forward to their game tonight. Have you seen Juventus this year and how good are they? They certainly gave us a game in the first leg. Do you think Pirlo should be man-marked?"

Barney replies:

Hello. I've only seen Juventus on the television this season - but have of course been very impressed. They are a very resilient team with a wonderful spirit. I wouldn't bother marking Pirlo particularly although no doubt one of Chelsea's central midfielders will niggle away at him and we have after all been promised a new more boring Chelsea tonight.

I think Vidal is a real threat too: a real driving runner in midfield of the type Manchester United could really do with. He's a bit Keane-ish. Roy not Robbie. I get the impression also that Juve are hugely up for this game, perhaps even a little more than Chelsea seem to be at this stage. That is not meant as a criticism. It's just the Champions League just seems very important to Juve this season.

12.13pm: mike65ie asks: "Does it matter if Alex Ferguson sends a second 11 to Turkey when the other three teams still have much to play for, separated as they are by just a single point?"

Barney replies:

He was very careful about this at his press conference last night. It's a difficult one. In a way you earn the right to rest players by winning your games. On the other hand it is a massive stroke of luck to play United now and not six weeks ago. And then again uefa have constructed an overloaded competition to maximise TV revenue to they're going to get this. Either way i think the team he plays tonight will be good enough to win. For the neutral it's also slightly more interesting to watch. Like the look of this Powell.

12.17pm: nitin25leo asks: "Should Chelsea start with any recognised strikers at all considering Torres's woeful form and Sturridge's profligacy in front of goal along with his inability to pass the ball when needed? Playing Moses up front would provide Chelsea with more of a physical presence."

Barney replies:

Moses is more of a chunky schemer than a "physical presence". He's best when he can turn and isolate a defender in a tricky area. Playing him as a Jermain Defoe type figure would negate his strengths.

How have Chelsea managed to have just one spare striker anyway? It is an amazing feat. Just out of interest, I wonder how many goals Gary Cahill would have scored by now if he'd been played up front all season. I think 5-7.

12.19pm: MyMondypops asks: "Do you think they will ever end the madness of the third-place team dropping into the Europa League to stop the chance of 'dead rubbers' or is the Champions League cash cow to important to UEFA?"

Barney replies:

The Champions League is a competition invented by money, for money and with the intention of furthering the future prospect of money. Every now and then it goes too far gets a tweak back into line – remember the second group stage? – but it will always push at the boundary of good sense. Having said all that, it is also a brilliant thing, the highest standard of football currently being played and I wouldn't muck about with. Beyond maybe losing a couple of groups of course.

12.23pm: cantthinkofagoodname asks: "Whose beard is better: Pirlo's or De Rossi's?"

Barney replies:

Juan Mata for me. The kind of beard usually worn by the kind of men who push around high-end organic coffee hipster-trolleys and who look like they're going to pull a knife when you say "yeah and five sugars mate".

12.30pm: Definatelynotashark keeps it on topic, just about: "You dropped below the line recently and admitted you do this occasionally to see if anyone is slagging you off. If you found someone giving you jip, for instance on a Champions League blog, what member of the Guardian sports staff would you choose to sort said person out, if you were so inclined? I'm thinking Paul Doyle."

Barney replies:

Everyone who works here is far too busy knitting their own hemp-flavoured yoghurt to have the time to think about being tough. You should come and have a look round the desk some time. You could wipe the whole of Guardian sport out with a minor mice-infestation

12.32pm: nitin25leo asks: "What do you think on Chelsea's seemingly over dependance on the so called "three amigos" of Oscar, Mata and Hazard?"

Barney replies:

I don't agree. There is an awesome amount of talent there. This is not Chelsea's problem. What they need is someone who can stick it in the net. Put Gary Lineker in that team and they'll win the league by five points. And he's 49 years old.

12.34pm: MrMondypops asks: "Do you think there could be another new name on the trophy this year, with most of the big pre-tournament favourites not playing consistently well?"

Barney replies:

I really, really hope so. I would love it - love it - if either Borussia Dortmund or Ajax could win it. But they won't. For my part I'm just a massive ABB (Anyone But Billionaires). There should be a carbon footprint handicap. These people are destroying the finer aspects of sport.

12.39pm: RuairiGucks asks for some thoughts on Celtic: "They are now 90 minutes away from qualification to the group stages (a score draw should do it, depending on the Barcelona result). Neil Lennon has worked wonders there on a shoe-string budget, while some of his bargain basement signings (Wanyama, Forster, Hooper) have been the talk of Europe for weeks now. A huge game for the Bhoys, and what an achievement it will be should they qualify. They were fourth ranked in the group."

Barney replies:

Talk of Europe might be going a bit far but it would be a great thing if they could make it to February, plus if Celtic win tonight and Barcelona lose it's all going to the last game in that group. This is admittedly a big if, but I'd like to see Celtic do it, if only because I'm a sucker for those green and white hoops in Europe and the ahem "excitement" of European matches in Glasgow. Of the players you list Wanyama looks likely to be sold from what I hear. He is just too good to stay put - and too Premier League-friendly too. Plenty of teams who'd like a slice of that.

12.42pm: MrGarethE asks: "As a journalist, do you still get excited about 'glamour' trips like heading to Galatasaray? Is there a sense of ennui even in the press box for the group stages of the Big Cup?"

Barney replies:

Of course it's exciting. There is a sense of ennui in any press box but it's all very carefully staged and studied and beneath it all lurks a kittenish excitement, hearts of gold, boyish charm, semi-serious drink problem and all the other things you'd expect.

12.44pm: Sameoldcabbage asks: "Do you see any chance for Manchester City against Real Madrid? Personally, though the Spaniards may concede one or two, I simply don't see them not scoring at least one more, despite City's unbeaten home record this season."

Barney replies:

There is always hope. But not much. Real Madrid are a wonderful European team. City are a work in progress.

12.46pm: GhostWiper asks: "Do you think that prank call on Ashley Young by the Galatasaray fan is possibly the worst prank call ever? It's just rubbish. I mean, the bloke just sits there for ages saying "Young" to a receptionist and then screams "welcome to hell" before hanging up."

Barney replies:

I hate the very idea of a prank call. The kind of thing a semi-unknown mid-1990s regional radio shock jock gets up to. Always involves lots and lots of forced background laughter and... Hang on... Is this a prank question? Paul Doyle? Is that you?

12.49pm: packrat asks: "Do you think Pirlo is still much cop? Or did he just sleepwalk magnificently through a game we all saw against a rubbish England team, giving a false impression of greatness?"

Barney replies:

He was very good against England, but not just them. They were perfect opponents for him, frantically but pointlessly energetic for 50 minutes and then slowly congealing to walking pace, where he was waiting for them. For the last hour he looked like the only grown up on the pitch. I'm still not sure why Wayne rooney didnt try to get closer to him. Ego perhaps? Or tiredness. Or lack of direction.

12.55pm: Barney is off to enjoy the Istanbul afternoon:

It's balmy, sunny and it smells very strongly of cigarettes. A lot of people already wondering around in Galatasaray kits but most of them seem to be on lunchbreak from work.

Elsewhere on the football site today we have Richard Williams on the topic of David Beckham, Alex Ferguson's statue in The Gallery and Ewan Murray on Celtic's rising star, Victor Wanyama.

Thanks for all your comments and questions.