Diogo Dalot will undergo his medical at Manchester United this week, according to Sky Sports.
The Porto fullback will likely join Fred as United's first two signings of the summer.
United bea Barcelona and Bayern Munich to Dalot when they were the first to activate the £17.4million release clause in his Porto contract.
At just 19, Dalot broke into Porto's first-team this season and done enough to convince Jose Mourinho he could replace Antonio Valencia in the future.