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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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.