The Germany international has barely featured under Unai Emery in 2019/20, making just one appearance in the Premier League.
But that was just his third appearance in all competitions and his team-mate Kolasinac revealed the exclusion has been getting to the midfielder.
“Mesut is a really driven player,” Kolasinac told Premier League Productions, as reported by the Standard.
“He is a bit unhappy at the minute but you would never see that in his training.
"He is doing everything he can. He is doing extra sessions to make sure he is at the level he needs to be.”
He added: “Mesut is Mesut. He has got a lot of special qualities.
“For example, the opposing team might put two players on him players on him rather than one — which creates a lot of space for others. That makes a real difference on the pitch and in the game.
“Everyone knows the quality he has, we have seen it. He is one of the top players in Europe and I think he can achieve a lot and really help the team further when he’s back.”
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