Mancini left Manchester City at the end of last season.
"For me it is good because I have good memories of England. I am happy to play this game firstly because it's here in London and after because it's the Champions League. We know it will be really difficult because Chelsea are one of the best teams in Europe, but in football I never say never. Anything can happen. If they beat us it's because they are better but we want to try."
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