The Serie A outfit are expected to cash in on the right-back this summer and several of Europe's biggest clubs will bid for his services. Torino will accept an offer in the region of £15million, which falls well within Louis van Gaal's budget.
Old Trafford officials are set to hand the Dutchman a transfer budget of around £150m to reinvigorate the Red Devils squad. The pressure will be on to challenge for a 14th Premier League title and Van Gaal is looking to upgrade several positions.
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While not an immediate priority, Van Gaal believes the right-wing-back area needs strengthening. Rafael has failed to impress the new manager and looks set to leave when the transfer window reopens.
Southampton's Nathaniel Clyne and Dani Alves had both been linked with a move to Old Trafford, but the former is likely to cost in excess of £20m while the latter has hinted that he may now stay at Barcelona despite an ongoing wrangle over a new contract.
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Darmian has impressed for Torino this season and was also in good form as he took on England in last week's 1-1 draw in Turin. He played 73 minutes against the Three Lions and his departure from the field was soon followed by an England equaliser.
Manchester United will have to battle with Bayern Munich and Real Madrid if they want to sign the right-back. Carlo Ancelotti is expected to cool his interest after agreeing a deal with Porto defender Danilo but Pep Guardiola remains interested.
Bayern represent a better opportunity to win silverware, but may not be able to offer Darmian as much first-team football as Manchester United can. Wages in the Premier League are likely to dwarf those of the Bundesliga as well.
There would be significant risks that come with signing Darmian. Very few Italians have made it in the Premier League and historically players have struggled to adapt their game to suit the Premier League.
Darmian has no experience in the English game and there is no guarantee he would succeed at Old Trafford. Meanwhile, Clyne has already proven he is good enough to make it and would find it much easier to adapt to life at Manchester United.
Dani Alves doesn't have any experience in English football, but is considered one of the best wing-backs in the world. Both would be better options than Darmian. At best, the Italian could be considered a third choice if Clyne and Alves do not join.
Who do you think Louis van Gaal should sign if Rafael leaves? Give us your opinion in the comment box below!