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Jose Mourinho has said referee Michael Oliver saved Manchester United's season from "total disaster" with his red card for Ander Herrera in the FA Cup quarterfinal defeat at Chelsea in March.
United, now unable to claim Champions League qualification via a top-four Premier League finish, will play their 62nd game of the season at Southampton on Wednesday.
Having had the Manchester derby against City rescheduled to last month due to their run to the EFL Cup final, United would have faced further fixture upheaval had they progressed to the last four of the FA Cup.