Brazilian defender Gabriel was taken off after only 16 minutes of the match when he pulled up as he raced back to defend, and the centre-back was replaced by Jakub Kiwior. Arsenal would go on to win the game 2-1, with the returning Bukayo Saka scoring what would prove to be the winner only seven minutes after coming on.
But the Gunners also lost Dutch defender Timber in the second period too, as the former Ajax man left the field having picked up a knee problem in the first half.
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Speaking to BBC Radio Five Live about Gabriel, Arteta said: "He felt something, he's not sure how bad it is. The fact that he could not continue is not a good sign, obviously. But we had to adapt, Jurrien was the same, we lost Ben (White) yesterday. Unfortunately it's been the narrative throughout the season, but let's keep working and see how he is."
Elaborating on Gabriel and Timber during his press conference, the Gunners boss added: "We don't know how they are going to be. We will be assessing them tomorrow. Two players in this team who never want to come off are those two. Jurrien was struggling very early in the game, he managed to continue and at some point he couldn’t."