Amorim has emerged victorious four times and drawn once so far, and his team is struggling at the 14th place in the standings.
Skipper Bruno Fernandes was sent off for the third time in the current campaign after United’s 2-0 defeat to Wolverhampton Wanderers, as they let a goal go in from a corner for the second time in three encounters.
There has also been a standoff with Marcus Rashford, since the homegrown star has been left out of the first-team squad for the fourth straight time under Amorim’s watch.
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Amorim’s failure to even get a ‘new manager bounce’ is in stark contrast to the situation at Wolves where compatriot Vitor Pereira has had two straight wins since replacing Gary O’Neil.
Pereira enjoyed a dream first home game on Thursday as his side beat 10-man United to climb out of the relegation zone.
Another Portuguese manager has also got the better of Amorim since he took over — Nottingham Forest’s Nuno Espirito Santo.
Forest’s 3-2 win against United was their first success at Old Trafford in almost 30 years and Espirito Santo has now led the Midlands club to third in the table — heights they have not seen since the days of the great Brian Clough.
While Forest are a point off second-placed Chelsea, United are closer to the drop zone than the top four and next host in-form Newcastle United and visit leaders Liverpool, plus Arsenal in the FA Cup, so things could get worse before they get better.
There is another Portuguese coach vastly outperforming Amorim too. Fulham’s Marco Silva on Thursday masterminded the club’s first win at Chelsea since 1979 — a 2-1 result that left them in eighth spot, one point behind fifth-placed Newcastle.
(With Reuters inputs)