Arsenal have suffered an injury blow in the warm-up for this afternoon's Premier League clash against Sunderland.
Laurent Koscielny has suffered a calf injury and has been forced out of the starting XI, with Carl Jenkinson coming in as a late replacement.
The French defender was a doubt before the match after suffering a knock on international duty in midweek but had passed a fitness test earlier today.
Jenkinson will now play alongside Per Mertesacker, Nacho Monreal and Bacary Sagna in a defensive reshuffle for Arsene Wenger's side.
