Arsenal manager Mikel Arteta says Bukayo Saka has suffered a hamstring injury.
The 19-year-old only managed play 45 minutes of Arsenal's win over Tottenham Hotspur on Sunday.
He was replaced by Nicolas Pepe, and Arteta confirmed Saka had sustained a tweak to his hamstring.
"We don't know. He was feeling his hamstring, so we will monitor that," Arteta said after the game.
Saka has been the standout player for Arsenal this season, having won the club's Player of the Month award for the last straight months.
