Chelsea's injury issues in the center of defense just got a lot worse. Gary Cahill started this game, as well as the first leg against Barcelona and the weekend's game against Arsenal, due to an injury to David Luiz. He's picked up a hamstring injury early in this one, but he's trying to continue. In the 7th minute, Cahill went down to block a cross by Alexis Sanchez and instantly grabbed his hamstring. He went off the pitch momentarily, then came back on.
Unfortunately, he couldn't play through the hamstring problem, and Jose Bosignwa has entered the game for him in the 12th minute. It's easy to see why he couldn't continue, this looks like it hurt quite a bit.
This leaves Chelsea with one fit true central defender, John Terry. Starting right back Branislav Ivanovic -- who has a lot of experience as a center back -- will shift to the center and Bosingwa will play right back.
We'll have live coverage throughout the game in our Barcelona vs. Chelsea, 2012 UEFA Champions League StoryStream. For more on the two teams, head over to Chelsea FC blog We Ain't Got No History and FC Barcelona blog Barca Blaugranes.