United have settled on personal terms with the fullback and will pay his €20m buyout clause to ferry him to England when the transfer window opens.
O Jogo says Porto's board is angry over the developments as they expected Dalot to stay and sign a new deal. If they had been aware of his plans, Porto would never have sold Ricardo Pereira to Leicester City last week.
Tied to Porto only for another year, Porto attempted to open talks with his agent, Carlos Gonçalves, at the end of the season. But the meeting was a short one, with Goncalves informing Porto directors that he had agreed to move elsewhere.
Dalot's destination has now been confirmed as United, with the deal to go through when the international transfer window opens on June 8.