The Brazil global - who is likely to play a key role for the Selecao at this summer's World Cup - was reportedly close to signing for Manchester City back in January but it appears the Red Devils have won the race for the 25-year-old's signature.
Along with Daley Blind and Luke Shaw, Darmian has little future at the club as Mourinho, who signed a new contract in January that will keep him at Old Trafford until at least 2020, seeks reinforcements.
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The Manchester Evening News believes that United are the firm favourites to land Fred.
Who are Manchester United most likely to sign this summer?
The Brazilian midfielder was heavily linked with a move to Manchester City back in January as Pep Guardiola looked to sign a long term replacement for Fernandinho, but was unable to agree a deal with the Ukrainian side.
It's thought that Fred could be a replacement to Marouane Fellaini, with the Belgium global becoming out of favour with Mourinho.
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As for Morata, the Spanish forward also didn't make the World Cup squad for his native Spain after a stop-start season at Chelsea under Antonio Conte.
The highly-rated midfielder, 17, was part of the U18 team that won the Northern Premier League title this season.
Tottenham defender Toby Alderweireld is also reported to be on United's wanted list, with defenders Luke Shaw and Matteo Darmian, midfielders Juan Mata and Marouane Fellani, as well as forward Anthony Martial all tipped to leave this summer.
It seemed to have cleared the field for Manchester United to go ahead and get their man, but things seemed to have been complicated by Barcelona's entry into the picture as a potential suitor for Fred.
OnePlus 3 & 3T Receive Face Unlock & Plenty Of New Features
This specific update offers Face Unlock feature and along with that, some other miscellaneous features have also been rolled out. The " Large Files " category has been included in the File Manager, while a new widget has been added for weather.