Koscielny misses match vs. Swansea City with calf problem

Arsenal defender Laurent Koscielny will not play in Wednesday's match against Swansea City after sustaining a "slight" calf injury, according to the London club.

Gabriel will start in place of the Frenchman, who has started 24 of 27 Premier League matches this season. Per Mertesacker also returns to the central defence after missing last weekend's 3-2 loss at Manchester United.

The injury comes at a bad time for the Gunners, but it doesn't appear to be severe. Arsenal faces Tottenham in the North London derby on Saturday.