Arsenal forward Kai Havertz is set for a spell on the sidelines after suffering a knee injury, sources have told ESPN.
The 26-year-old missed an open training session at Emirates Stadium on Wednesday but it is currently unclear how severe the issue is.
Sources say the club are waiting for the injury to settle down before undergoing further tests to determine the full extent of the problem.
Any lengthy spell out would be a significant blow to the Gunners, who are still without Gabriel Jesus for a prolonged period after undergoing knee surgery in January.