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The benefits to Chelsea extend beyond just this week, however. Mourinho recently highlighted how Liverpool's lighter fixture list might give them an edge in the Premier League, saying (via The Mirror) "Liverpool only play one match every week, and that makes a real difference at the end of the season."
Although Chelsea still have the Champions League to worry about, as we get towards crunch time, it could really help them to have a few extra breaks.
Man City, on the other hand, are still competing in the FA Cup, as well as the League Cup final, which both take place at the beginning of March. Furthermore, they now face Barcelona in two days in the Champions League. They already have an arguably tougher set of League fixtures ahead of them, so each time they add another fixture in one competition, it will definitely benefit their rivals in the others.
It is also worth noting that Arsenal progressed in the FA Cup as well this weekend, meaning that Chelsea can sit back and relax while their two closest rivals fight for their places in the FA Cup Semifinals.