Dalot, who primarily plays at right back, follows Brazil global and former Shakhtar Donetsk star Fred to the Theatre of Dreams.
Dalot joins Manchester United from Porto, where he is expected to play second fiddle to Antonio Valencia.
The M.E.N claims that the 19-year-old is now in London visiting family but is due to undergo his medical at United's Carrington training base later this week and complete his move.
The 19-year-old can play on either flank in the back four, having made his Champions League debut for Porto at Liverpool in March on the less familiar left-back role.
Diogo Dalot has vowed to give "everything" for Manchester United after his move from Porto was confirmed.
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"He has all the attributes that a full-back needs: physicality, tactical intelligence and technical quality, combined with a Porto Academy mentality which prepares players for the maturity they need at the professional level".
According to Skysports, Portuguese right-back Diogo Dalot has completed his medical ahead of a proposed move to Manchester United.
'I have grown up in Porto's Academy and I am so thankful for everything they have done for me.
While his first team appearances have seen him feature as a fullback, he has also been playing for the reserves - in Portugal's second tier - as a wide midfielder, suggesting he has a future as a versatile all-rounder.
Matteo Darmian has been linked with a switch to Juventus in recent weeks, which would leave Mourinho short of specialist right-backs in his squad.