• Coach sends on holding midfielder to tighten up formation
• Move helps to nullify visitors' counterattacking advantage
This 1-1 draw was an interesting tactical battle. Chelsea were utterly dominant for the first half-hour before Roberto Mancini's first substitution – sending on Yekta Kurtulus for Izet Hajrovic – helped Galatasaray back into the contest.
The first half's key feature was Galatasaray's high defensive line, which was repeatedly breached by Fernando Torres making runs behind it. Perhaps Mancini was attempting to replicate the tactics deployed by his former club, Manchester City, in their 2-0 FA Cup win over Chelsea. The City defence played high up the pitch and minimised the space between the lines, closing down the Chelsea attacking midfielders as soon as they received passes.
Galatasaray's system was more open and they failed to put pressure on the ball in midfield, inviting more direct play. Using two strikers and two attacking wide midfielders in a 4-4-2 was risky by Mancini. When Chelsea won possession, Felipe Melo and Selcuk Inan were unable to cover such a large space in midfield, especially against three Chelsea players in that zone.
Torres does not possess the lightning acceleration of his Liverpool days but he enjoyed an enormous speed advantage over the Galatasaray centre-backs Hakan Balta and Aurélien Chedjou. Balta was exposed repeatedly in the first half, most obviously when he was extremely fortunate to be awarded a free-kick when competing for a long ball against Torres – this wrongly denied the Spaniard a one-on-one with Fernando Muslera. Balta was removed at half-time. Fernando Muslera was uncomfortable playing behind such a high defensive line, mishitting an early clearance when sweeping to hand Willian the chance to chip from distance, then darting forward unnecessarily for Torres's goal.
In keeping with his fellow defenders' positioning, the right-back Emmanuel Eboué played in a very advanced position and repeatedly misplaced passes with his midfielders too overworked to cover for him. Torres struck after Eboué conceded possession and Chelsea counterattacked into the space he had vacated. César Azpilicueta played an unusually attacking role when Chelsea countered, and assisted Torres's opener.
While Mancini's starting strategy was illogical, he deserves credit for changing the game with a decisive tactical substitution after half an hour. The holding midfielder Kurtulus replaced the right-winger Hajrovic as Galatasaray switched to a 4-1-4-1. They were no longer exposed in midfield and thus less prone to through-passes.
"Every attack we lost four players [ahead of the ball]," Mancini said. "This is impossible against Chelsea because they want to play on the counterattack and we conceded the counterattack every time. We needed another midfielder." It helped Galatasaray grow into the game, and while Chelsea still had opportunities on the break, it was an evenly balanced contest following Galatasaray's tactical shift.
After Chedjou's equaliser José Mourinho made a similar substitution – the winger Andre Schürrle was replaced by the defensive midfielder John Obi Mikel as Chelsea also moved to a 4-1-4-1 formation. With the sides now playing similar systems, the final half-hour was drab.