West Ham announced on Saturday the signing of United midfielder Jesse Lingard on loan until the end of the season, after completing the permanent signing of Said Benrahma.
England international Lingard, who has netted 33 goals in 210 appearances for United, had played just three times for the club this season.
United manager Ole Gunnar Solskjaer said he wanted the 28-year-old to return to Old Trafford "revitalised".
"I'm excited," said Lingard. "It's another new chapter in my life."
He added: "Nothing is guaranteed but I've come here to work hard and help the team and bring my experience. That's the main aim. I just want to enjoy my football and get back playing again and get my feet back on the pitch."
The Hammers were due to make winger Benrahma's loan move from Brentford permanent in the summer but they finalised the deal worth up to £30m earlier on Friday to free up loan space.
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