Anthony Martial injury: The Man Utd player was chasing back (Image: BTSPORT)
Anthony Martial injury: Man Utd and Arsenal were locked at 1-1 at the time (Image: BTSPORT)
Anthony Martial injury: The forward needed immediate treatment (Image: BTSPORT)
Anthony Martial injury: Man Utd brought the player off (Image: BTSPORT)
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But the player fell awkwardly during a challenge and hit the deck.
The United physio ran on to treat Martial but immediately indicated to the bench - signalling a substitution was required.
He was replaced by Romelu Lukaku as United sought a winner.