I hope he's not broken his leg. I wouldn't wish that on any player. Hopefully its not as serious as it first looked.
"BBC Radio 5 live are reporting that John Terry is still at Stamford Bridge and is receiving treatment from the club's medical staff. They also say he is able to bend his knee."
He really let out a loud scream when he went down! I dont know for sure but my guess is he will miss games!