Thomas Partey did not finish our game at Aston Villa.
The Ghana midfielder pulled up in the second half and was replaced by Willian with 15 minutes left.
"He had a muscular injury so we had to take him off," said Mikel Arteta after the game. 'He could not carry on playing.
"I don't know [how bad it is]," he added.
"We will see the extent of the injury. He wasn't feeling well enough to continue playing so we had to take him off."
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