His knee seemed to take a heavy knock and he now faces a race against time to be fit for Arsenal’s clash with Chelsea.
The two Premier League giants meet on January 3 at the Emirates but Kolasinac will do well to recover before then, even if it is just a minor knock.
Ainsley Maitland-Niles was brought on as his replacement and would be the most likely candidate to replace him in the starting XI should the Bosnian be unable to make it.
Mesut Ozil may also be struggling to face the Premier League champions as he missed the West Brom contest with a knee injury.
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