The Italy international went on to make 92 appearances for the club, helping them to the FA Cup in his first season.
However, he made only seven appearances for United last season and has not featured at all this term.
Darmian had played only 13 times for the club since December 2017 and his contract was due to expire in 2020.
His move comes after fellow defender Chris Smalling
while forwards Alexis Sanchez and Romelu Lukaku have both joined Inter Milan.
United manager Ole Gunnar Solskjaer had been willing
while forwards Alexis Sanchez and Romelu Lukaku have both joined Inter Milan.
United manager Ole Gunnar Solskjaer had been willing
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