Sead Kolasinac injured: Arsenal defender replaced by Ainsley Maitland-Niles in West Brom clash
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SEAD KOLASINAC limped out of Arsenal's clash with West Brom following a late Gareth Barry challenge.
The Bosnian defender, 24, was replaced by Ainsley Maitland-Niles after 37 minutes.
Kolasinac will now be a doubt for Chelsea's visit on January 3.
Barry was not booked for the tackle, which saw him catch the Gunners ace with his knee after the ball had gone.
The teams came into the break goalless, with Alan Pardew yet to manage a first-half strike as West Brom boss.
Kolasinac was one of five outfield players who did not rush over to celebrate with Alexis Sanchez in Arsenal's win over Crystal Palace.
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Laurent Koscielny, Jack Wilshere, Hector Bellerin and Calum Chambers were the others not to get involved.
And Gunners legend Thierry Henry believes the scenes were evidence of a rift in the dressing room.