Manchester United have completed the signing of 19-year-old Portuguese full-back Diogo Dalot (best young full-back in Europe) from Porto for £19m, both clubs confirmed on Wednesday.

Dalot has signed “a five-year contract, with an option to extend for a further year”, United said in a statement.

Dalot has represented Portugal from under-15 to under-21 level and made his Porto debut in October.

“The chance of coming to the biggest club in the world is something I just couldn’t turn down,” said Dalot.

The transfer should hasten the exits of Italian full-back Matteo Darmian, who has been strongly linked with Juventus, and Netherlands defender Daley Blind. Neither player has a long-term future under Mourinho.

He is determined to strengthen his defence for what he hopes will be a far closer Premier League battle with champions Manchester City next term.

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