For Amorim to succeed at a club like Manchester United, he would need to prove that he can handle the intense pressure, motivate a team with diverse talents, and establish a consistent, winning strategy. His victory over City is impressive, but only time and experience will show if he’s truly ready to lead a team of United’s caliber back to the top. It would certainly be interesting to see how he fares, but for now, he remains a promising coach who is not yet in the same league as the likes of Guardiola.
Pressure at Manchester United is bigger than at Sporting Lisbon and any young coach has to grow up his coach career this way. Amorim will have to step on this way too, challenge himself, beat pressure and hit a new milestone for his career, not only by taking a job at a bigger club like Manchester United, but also succeed there.
A big victory against Manchester City in Champions League, days before his official job start in Manchester United, is very big booster for his confidence at his new club. Manchester United also see a lot of hope with this coach from his big win against Manchester City. If Manchester United can succeed to come back as one of strongest clubs in Premier League, it's good for them and for the league. Guardiola seems to go to the end of his era in Manchester City, some signals of failures recent months and he doesn't have style to stay for so long at one club.