Arsenal have suffered a setback following Alexandre Lacazette's positive test for Covid-19.
The striker was absent from training this week and was thus left out of the squad for Saturday's trip to Southampton, with Eddie Nketiah selected to lead the line in his place.
Arsenal have already been dealt a blow by injuries to Kieran Tierney, Takehiro Tomiyasu, and Thomas Partey.
Mikel Arteta's men face Chelsea and Manchester United next week, and Lacazette appears to be in a race against time to feature in at least one of those matches.
Lacazette has struggled for form recently, but he is a vital presence in the Arsenal dressing room and has been named captain following Pierre-Emerick Aubameyang's move to Barcelona.
Nketiah was picked to lead the line against Southampton, but Mikel Arteta might use Emile Smith Rowe or Gabriel Martinelli as a No9 if necessary in the coming days.