The 23-year-old missed Uruguays 1-1 draw with United States in Missouri on Tuesday evening due to muscular discomfort.
Torreira is now travelling travelling back from the United States to London and will need to be assessed by Arsenals medical staff.
Unai Emerys side are due to travel to Vicarage Road to play Watford on Sunday afternoon.
Arsenal will also be closely monitoring Granit Xhakas fitness after the midfielder revealed that he has been suffering from an Achilles problem since the start of the campaign.
Elsewhere, Arsenal will be hoping that Alexandre Lacazette will be available after Read More – Source