The Manchester club confirmed Amorim’s arrival on Friday, and he has signed a three-year contract with the option to extend it by another year.
Before leaving Sporting CP during the international break, he will oversee three more games before formally taking over on November 11.
Ruud van Nistelrooy will take over for him in the next three games against Chelsea, PAOK, and Leicester. His debut game as manager of United will be against Ipswich on November 24.
Amorim was considered by Liverpool earlier this year as a potential replacement for Jurgen Klopp, so this appointment is noteworthy.
Xabi Alonso, Roberto de Zerbi, Julian Nagelsmann, and Amorim were all taken into consideration, but Arne Slot was the clear favorite.
Instead, the Portuguese will lead United to Anfield on January 5 and take the dugout alongside Liverpool’s rivals.
Four days after Erik ten Hag was fired, he was hired. United quickly reached an agreement with Sporting CP for a deal worth about €10 million.
Sporting CP, who won the league under Amorim last season by a 10-point margin, are now leading the Portuguese first division with nine wins from nine games thus far.
Because of their divergent playing philosophies and the fact that Amorim’s preferred back three system was incompatible with the current team, Liverpool decided not to pursue him as Klopp’s replacement.