The Blues went 1-0 down in the first half to an own goal by Cesar Azpilicueta, but recovered with an own goal by the visitors and a strike by Branislav Ivanovic.
The Argentine laid off to Nasri, who tried to play a 1-2 with Aguero, only for the ball to ricochet back to the Frenchman off Cesar Azpilicueta and he calmly slotted it past Cech.