Manchester United are set to sign Porto defender Diogo Dalot after meeting his buyout clause on Tuesday.

The Mirror reports Dalot, 19, is set to become Jose Mourinho's first summer signing after United activated his £17.4million buy-out clause at Porto.

United manager Jose Mourinho feels the teenage Dalot has great potential, even though the defender has only made seven senior appearances for Porto since breaking through into the first team in February.

Porto had hoped to hang on to Dalot for at least another season and had rebuffed interest from other clubs.

But they were left powerless when United activated his buy-out clause of 20million euros or £17.4million.

Personal terms have been agreed in principle and Dalot should become a United player within days.