The one-year extension will tie the Belgian midfielder to Old Trafford until at least the summer of 2018.
The 29-year-old scored his first goal of the season during the win against Hull City on Tuesday.
Fellaini joined United from Everton on the final day of the summer transfer window in 2013.
— Manchester United (@ManUtd) January 12, 2017
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Five English clubs will compete in the last sixteen of the Champions League for the first time ever as Liverpool, Manchester United, Manchester City, Chelsea and Tottenham face some difficult away matches.