While Diogo Dalot is returning to the club where he made his name, the full-back is not the only Manchester United player facing his former side.
Casemiro had a loan spell with FC Porto, spending the 2014/15 season there during his Real Madrid days. The Brazil international helped the Dragons reach the quarter-finals of the Champions League, scoring a free-kick in the game against Basel in the competition.
The midfielder gained the continuity of regular first-team football that helped him to become a mainstay at Real, after they brought him back to the Bernabeu, and he has told team-mate Antony about the magnificence of the Estadio do Dragao.