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Manchester United will monitor Ander Herrera's fitness ahead of the Manchester derby this week, sources have told ESPN FC.
Herrera played 90 minutes as United beat Burnley 2-0 at Turf Moor on Sunday, but he was left hobbling by the end of the game after taking a heavy knock on his ankle.
The midfielder is set to be assessed on Monday, although United are hopeful he will be able to shake off the problem in time to face Manchester City at the Etihad Stadium on Thursday.