Sooo drawing Athletico is huge for a number of reasons:
1. Athletico are arguably the weakest out of Bayern and Real, they haven't made the semi finals in 40 years and will possibly lack the experience.
2. Jose knows Athletico, at Real he never lost in I think 6 matches. He will know their weaknesses and how they can be exposed.
3. Thibaut Courtois. So in his contact Athletico need to pay Chelsea 2.5m for each appearance against the club. Athletico can't afford it, and Courtois has been a big part of getting the club there. Playing without him would be a massive blow, just as paying 5m could be. UEFA are apparently stating that the contract is invalid, even still we know Athletico want to land him on a permanent basis and if they go against Chelsea they could ruin their chance.
4. In saying number 3, the other possible outcome is Diego Costa. Chelsea want him, Athletico know this and they want Courtois. The 5m that they would owe Chelsea could easily be written off in the even that they agree on a fee for the trading of these two players.
I really hope we land Costa, Courtois seems intent on staying but at the same time Chelsea NEED a contingency plan for Cech. Brilliant young keepers don't seem to come along often however, he was never really given a chance at Chelsea and seems to enjoy Athletico.