ARSENAL star Riccardo Calafiori hobbled off injured against Shakhtar Donetsk.
The Gunners were 1-0 up in their third Champions League game of the season when the defender appeared to hurt his knee.
With 68 minutes on the clock, Calafiori slipped and appeared to twist his knee on his way down.
The Italian briefly tried to soldier on after receiving treatment but immediately signalled to the bench that he would have to come off.
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