The Red Devils had offered him an extension in the summer and have now rewarded his performance with a deal running on to 2020.
Henrikh Mkhitaryan has been left out of United's 18-man squad for seven of their last eight matches and is out of favour at the club.
Jose Mourinho is expected to make a number of changes to his Manchester United side when they take on West Brom on Sunday.
Adidas are increasingly confident of agreeing a new £1m-a-year boot deal with Manchester United striker Romelu Lukaku.
Romelu Lukaku's decision to snub his former club Chelsea for Manchester United saw Antonio Conte's side sign Alvaro Morata from Real Madrid in the summer.
Romelu Lukaku has struggled to impress with the goal after having a good start to his life at Manchester United.
Ferdinand suggests Lukaku might be struggling to deal with pressure but backs the Belgian to recover his form.
Romelu Lukaku was caught on camera appearing to kick out at Brighton and Hove Albion defender Gaetan Bong during a 66th-minute tussle at a corner.
Romelu Lukaku will face no further action after allegedly kicking out at Gaetan Bong during Manchester United's 1-0 win over Brighton & Hove Albion.
Mourinho claims he 'did not care' about Lukaku not scoring against Brighton and was happy with his contribution.
Manchester United striker Romelu Lukaku is potentially facing a three-game ban with the FA set to review video footage showing him kicking out at Brighton's Gaetan Bong twice.
Ibrahimovic returned after a seven-month absence with a cruciate knee ligament injury in United's 4-1 win over Newcastle.
Pogba made a scoring return from a hamstring injury in the Red Devils' 4-1 win over Newcastle United at Old Trafford.
The former Sweden captain remains a "fighter" according to Mourinho, following seven months out injured.
France international Martial, 21, has only started three Premier League games for United this season.
Jose Mourinho will be delighted after Romelu Lukaku found the back of the net on three occasions in the last two matches for Belgium.
Fellaini, 29, returned from a one-month knee injury layoff to play as a substitute in United's 1-0 defeat at Chelsea.
Romelu Lukaku, 24, endured an evening to forget as Chelsea inflicted a 1-0 defeat on United at Stamford Bridge.
Manchester United have failed to score more than two goals since their 4-0 win over Crystal Palace at Old Trafford.
Lukaku has gone without a goal for United since netting in a 4-0 win over Crystal Palace in September.
Paul Pogba has been sidelined with a hamstring injury since Manchester United's win over Basel in the Champions League in September.
Anthony Martial's introduction for Marcus Rashford in the 70th minute was booed by some sections of the Old Trafford support.
