Arsenal did not have a great day on Saturday. The Gunners were beaten 6-3 by Manchester City, Mesut Ozil was given a public rollicking by Per Mertesacker and Laurent Koscielny was stretchered off injured.
This is a picture of Koscielny's knee, as per a post on his official Facebook page. The injury was the result of a failed attempt to stop City striker Alvaro Negredo from scoring (see above).
Look away if you're eating. Laurent Koscielny's knee (via Facebook) pic.twitter.com/zRte1Bp9w3— Bleacher Report UK (@br_uk) December 14, 2013
The French international Koscielny will surely be doubtful for Arsenal's upcoming fixtures.