Those of you that can’t get your head around why Amorim wouldn’t want Osimhen might want to spend some time reading this Sporting fans analysis of his time there. An interesting read: (found on Twitter)
1 - Don't expect a miracle: This is the absolutely most important point of all, hence why I open with it. When Amorim took charge of Sporting he also started midway through the season (although much later on), and at the end of that season Sporting finished fourth, worse than the usual third at that time. Amorim needs months to implement his style of play (which I'll touch upon later on), and, just like Sporting at the time, Man Utd's team is not very compatible with it. With that said:
2 - Expect "big players" to leave: Amorim will most likely sell players that might have been huge assets to the team previously, but simply don't match his style and may even detract from it (more on that in a bit). If you look at the team Amorim inherited when he took charge of Sporting and the team with which he started his next season, you'll see what I mean
3 - Locker room management: Amorim has always made it a stipulation that the players he manages are positive influences on the locker room dynamics, getting rid of players that might be huge assets but otherwise damage the team in some way. As examples you have Marcus Acuña, which was one of the best players Sporting had at the time, but as he was extremely hot headed, and so was immediately sold on the first transfer market window under Amorim, and Islam Slimani, which returned to Sporting as a fan favorite and immediately started scoring goals, which our main striker wasn't doing. Slimani, however, started getting cocky, and was immediately pushed to the sidelines and left after only half a season.
4 - Tactics/formation: Expect a 3-4-3 every time, all the time. Amorim barely deviates from this formation, instead changing the players in the starting eleven depending on the characteristics he wants the team to display.
5 - Transfer policy: As previously stated, Amorim most likely won't even consider someone who could destabilize the team's backroom dynamics, and that means a lot of big, established players are unlikely to join as tensions could arise from that, and if Slimani's case shows anything is that Amorim would rather have a strong team union than individual stars. Due to this, expect Man Utd to sign more young and/or lesser known players, also likely for cheaper, that have large amounts of potential (this was the exact model that brought players like Gyökeres to Sporting).
6 - Youth academy: If Amorim can get any players from the youth academy, he definitely will. Strangely enough, Amorim is one of the few well known Portuguese managers that has this sort of youth academy policy, which is funny because almost every Portuguese manager follows it, they're just not well known.
7 - More than 11 players: If Amorim is given enough time at Man Utd, expect him to assemble a team where the players sitting on the bench are just as capable as the ones on the pitch, differing only in what aspects are stronger in their game.