Arsenal's Alexis Sanchez injury doubt for Sunday's match against Aston Villa

Arsenal manager Arsene Wenger has revealed that Alexis Sanchez could miss this Sunday's Premier League match against Aston Villa.

The Chile international is struggling with a hamstring injury, but will face a late fitness test on Saturday to determine his availability.

"The squad will be exactly the same as last Sunday," Wenger told the club's official website. "The only uncertainty we have is Alexis Sanchez who has a hamstring concern, and that will be decided on Saturday. He might be out for Sunday."

Wenger has suggested that new signing Gabriel Paulista could make his debut at the weekend.