Koscielny scored Arsenal's opening goal during their 3-0 win over Stoke City on Sunday, while also adding two tackles, three interceptions, three clearances and 40 passes.

Koscielny continues to be the rock in the Arsenal defense, as they play significantly better when he is on the pitch with Per Mertesacker. The two will be needed at their best next weekend, as Arsenal travel to the Etihad Stadium to take on Manchester City.

Koscielny (calf) had two shots, two interceptions and 10 clearances during Arsenal's 2-1 win over West Ham on Sunday at Upton Park.

Koscielny returned from his calf injury at a great time for Arsenal, who have been struggling in the back recently while he's been injured. Up next is a tough New Year's Day match at Southampton.

Manager Arsene Wenger said Tuesday that Koscielny (calf) will not play Friday against QPR, but he could return Sunday against West Ham.

Koscielny has been quite injury-bitten this season, as he dealt with an Achilles issue before the current calf concern. The Arsenal defense could desperately use him, particularly Sunday against the steady West Ham attack led by Andy Carroll, Diafra Sakho and Enner Valencia.

Manager Arsene Wenger said Thursday that Koscielny (calf) "will not be quite ready" for Saturday's match against Newcastle.

Koscielny's absence leaves Arsenal with a big hole, as Nacho Monreal is out with a foot injury and Calum Chambers is suspended.

Koscielny will not travel to Turkey for Tuesday's Champions League match against Galatasaray, as manager Arsene Wenger will rest him again with the hope he can play Saturday against Newcastle.

Arsenal have already qualified for the round of 16, so Wenger will take a depleted side to face Galatasaray. Koscielny has been dealing with an Achilles issue for much of the season, so he will likely be rested here-and-there, particularly during the condensed holiday schedule.

Koscielny (Achilles) was an unused substitute during Wednesday's Champions League match against Borussia Dortmund.

Koscielny has been out since Oct. 5 due to the Achilles injury, and while he was held out against Dortmund, he could very well get back in the starting XI for Saturday's road match against West Brom.

Koscielny (Achilles) is in the squad for Wednesday's Champions League match against Borussia Dortmund, ESPN FC reports.

Koscielny was not expected back for another few weeks, but his return will be a big boost for an Arsenal side that has really struggled this season, particularly defensively. His return will move Nacho Monreal back to the bench.