Alexandre Lacazette is set to be out for between four and six weeks after having knee surgery, Arsenal has revealed.
The France international underwent an arthroscopy on his left knee on Tuesday, with the Gunners understanding the minor operation to have been "a success".
But the injury comes at a crucial juncture for Arsenal, who have important fixtures in the Europa League, Premier League and Carabao Cup all on the horizon.
Lacazette could miss a total of seven games across all competitions if he is ultimately out for six weeks.
Among those fixtures are the two UEFA Europa League last-32 contests with Ostersunds, plus a Manchester City double-header in the Carabao Cup final and Premier League.