Christian Pulisic will be out for "weeks" with a knee injury, according to Chelsea manager Graham Potter.

The United States winger was forced off in the first half of Chelsea's 1-0 loss to Manchester City on Thursday in the Premier League after a challenge with John Stones.

He missed the 4-0 defeat to Pep Guardiola's side in the FA Cup third round on Sunday, and Potter said after the match that Pulisic is set for a spell on the sideline.