The England international picked up the problem during the Gunners’ 2-0 defeat to Borussia Dortmund in Germany in the Champions League on Tuesday.
The 22-year-old’s injury is not believed to be serious, with some reports claiming that he will be fit to be involved in Arsenal’s Premier League clash against Aston Villa at Villa Park on Saturday (click here to read more).
Giroud is also injured at the moment, but he will not recover anytime soon. The France international striker recently underwent surgery on his left tibia and is expected to be sidelined until the New Year.
So such injury concerns for goalkeeper Szczesny, though. The Poland international is as fit as ever and was arguably the best Arsenal player against Dortmund at Signal Iduna Park.