Arsenal have confirmed defender Laura Wienroither has suffered a ruptured ACL, becoming the fourth player at the club ruled out by the same long-term injury.
The 24-year-old was substituted in the Gunners' Champions League semi-final second-leg defeat to Wolfsburg at the Emirates on Monday.
After tests, the club have now confirmed she has ruptured her anterior cruciate ligament, and will undergo surgery before a course of rehabilitation.