Pellegrini made a similar decision in February when forced to play an FA Cup tie with Chelsea three days before a Champions League match against Dynamo Kiev. They lost 5-1 to the Blues, but then won 3-1 in Ukraine.
‘Champions League qualification still in our hands’
Pellegrini was not concerned by the fact Manchester United and West Ham have closed the gap on them in the battle for fourth place.
City are five points above United and six clear of the Hammers – but have played a game more than both their rivals.
He said: “It’s exactly the same. It all depends on what we can do in these last two games. We are three points behind Arsenal and if we beat Arsenal we’ll be in third position before the last game.”