Manchester United today confirmed Dalot’s arrival.
The full-back has signed a five-year contract at Old Trafford.
And Mourinho was glowing about his praise for the Portuguese 19-year-old.
“Diogo is an extremely talented young defender with all the qualities to quickly become a great player for this club,” Mourinho said.
“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.
“In his age group, he is the best full-back in Europe and we all believe he has a bright future ahead of him at Manchester United.”
United triggered Dalot’s £17.5m release clause last month, meaning Porto were defenceless to stopping their youngster leave.
The Portuguese giants offered their academy product a new contract but he has decided to join United.
Mourinho’s side finished second in the Premier League this season – going the campaign without winning a trophy.
The boss is tasked with winning the title next term and is also closing in on a deal for Shakhtar Donetsk midfielder Fred.
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