Arsenal manager Arsene Wenger has admitted that he does not know how long Laurent Koscielny will be ruled out for.

Arsenal prepare to square off against Tottenham Hotspur in the North London derby on Sunday and it goes without saying that both teams will be desperately looking to claim a victory on the day with the Gunners after a top four spot and Spurs attempting to catch title favourites Chelsea.

As a major concern heading into the game for Arsenal though, Wenger has admitted that Koscielny could well be ruled out of the clash after picking up a knee injury in the 1-0 win over Leicester City on Wednesday night.

The Frenchman said: "Koscielny has a knee problem but I don't know how long he'll be out for.

"I have to check because I don't know yet."