Chelsea can't afford any more slip-ups in the Champions League if they are to make it through to the knockout stage. It's why tonight's visit of AC Milan is a game Graham Potter's side can't afford to lose and desperately need to win.
"They are a top team and we have to be really good to get the result we want," Potter explained at his pre-match press conference. "It [the Champions League] is a real challenge. If you drop your level, sometimes you can get away with it but against the very best teams, which these teams are, they can punish you and that’s what you expect."
Chelsea found that out the hard way against Dinamo Zagreb; the Blues lost their Group E opener 1-0 in Croatia. And one mistake meant that the home match against Red Bull Salzburg ended in a 1-1 draw. They are two results that have left Chelsea bottom of their group after two matches.