Lucas Torreira left Fratton Park on crutches after the Arsenal midfielder suffered an ankle injury during Monday's FA Cup win over Portsmouth.
Torreira was stretchered off following a first-half challenge, though did not need to be taken to hospital.
The midfielder has found himself out of the starting XI of late, but was one of nine changes made by boss Mikel Arteta for the cup clash in Portsmouth.
Torreira lasted just 15 minutes, however, with Portsmouth defender James Bolton taking both player and ball in a challenge that was hefty but deemed fair by referee Mike Dean.
Arsenal's physio team were immediately on the scene, providing the 24-year-old with oxygen and taking him off on a stretcher.
In Pictures | Portsmouth vs Arsenal | 02/03/2020
In Pictures | Portsmouth vs Arsenal | 02/03/2020
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Following the match, Arteta said: "Lucas was very sore and is in a brace. He will be assessed in a few days and then we will know more."
