Eberechi Eze is set to miss a crucial spell of Arsenal's season amid concerns he will miss about a month through injury.
Eze, 27, suffered a calf injury in last week's win over Bayer Leverkusen, which caused him to miss Sunday's Carabao Cup loss to Manchester City and withdraw from the latest England squad.
Sources have indicated initial fears are the attacking midfielder could miss between four to six weeks.
Arsenal boss Mikel Arteta said Eze will have a definitive scan this week to determine the full extent of the injury.