Calum Chambers was injured in a match against Chelsea in the 20th round of the Premier League, as a result of which he was replaced.
After a preliminary medical examination, Arsenal physicians have a serious suspicion that the Englishman has damage to the anterior cruciate ligament. If the worst fears are confirmed, then Chambers risks skipping the rest of the season, reports Daily Mail.
This season, Chambers spent 14 matches in the Premier League: he has one goal and one assists.
It was previously reported that Arsenal is interested in Upamecano.
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