The 39-year-old will start work at Old Trafford on November 11, with the task of revamping the squad and producing impressive performances. Man United are currently 13th in the Premier League table after a disappointing start to the season.
Amorim is considered one of the most talented coaches in Europe at the moment. However, the current Man United squad still has too many shortcomings, despite strong investment in recent years.
Amorim will be keen to strengthen the Red Devils' defence, especially in the centre-back position. New signing Leny Yoro has yet to play for Man United, while Matthijs de Ligt has also not been very impressive.
Jarrad Branthwaite could be a realistic option to add much-needed depth to Amorim's defence, with manager Sean Dyche admitting Everton are open to selling the centre-back. They will need as much money as possible to bolster their squad in a relegation battle.
Branthwaite has barely featured this season after struggling with injuries. This could reduce his value and make it easier for Man United to negotiate. Previously, the "Red Devils" had two bids rejected by Everton for the England international. With Amorim using a three-man defence, Branthwaite could play alongside De Ligt and Lisandro Martinez.
Another defender linked with United is Bayern Munich's Alphonso Davies. The Canadian's contract expires at the end of the season, sparking speculation that United could tempt Bayern with a January offer.
Davies remains an important pillar for the "Gray Tigers" and has started 7 Bundesliga matches this season. However, with Luke Shaw and Tyrell Malacia both having regular injury problems, Amorim will be determined to recruit Davies.
Man United are also in dire need of a reliable goalscorer, as demonstrated by Alejandro Garnacho, who is currently the team's top scorer with six goals.
The Old Trafford outfit have been heavily linked with Leroy Sane, whose Bayern contract expires next summer, and Amorim will try to land the former Man City star for the right price.
Sane is yet to make his Bundesliga debut under Vincent Kompany this season, making just five substitute appearances. Despite that, the German has still managed three goals in all competitions.
The fourth player United have been keeping an eye on is Sporting Lisbon starlet Geovany Quenda. The 17-year-old has attracted the attention of a number of clubs after shining in the 4-1 win over Man City in the Champions League.
According to MEN, Man United have added the winger to their transfer list. However, they may have to pay around £84m if they want to make Quenda the latest Sporting star to move to Old Trafford, following Cristiano Ronaldo, Nani and Bruno Fernandes.