He has enjoyed a fine season yet again this term and Sport are reporting that Premier League giants United and Chelsea are keen.
The 19-year-old defender made his debut for the Portuguese club last season and immediately impressed during his seven first-team appearances in all competitions. Deployed in an unfamiliar role as the left-back - the player is a natural at right-back - Dalot seemed unfazed by the step up and put in credible shifts.
The 19-year-old, who is a natural right-back but can also play on the left, has been followed extensively by United in recent months as they look for a long-term solution in their defensive ranks. Interest in Diogo Dalot has been present for a while now, with FC Porto rejecting multiple bids below the player's €20 million release clause.
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Dalot has already agreed personal terms with United with the highly-rated Portugal Under-21 global expected to push captain Antonio Valencia hard for a place in the first-team.
Dalot is expected to be given first-team opportunities, with Mourinho clearing out players such as Matteo Darmian and Daley Blind to make way for further recruits.