Doubt the injury is too bad; probably just a result of Diaby playing a bunch of games without hitting full fitness yet. Hell, I'm surprised he started all three matches so far given his precarious injury situation though Wenger has never been known for his common sense fitness wise. I'd be more worried if he played the next France match; as it is, hope Wenger rests him for either Southampton or Montpelier. Think both would be relatively lower pressure opportunities for Coquelin to show he's finally ready this season, especially with City and Chelsea right after that.