The Portuguese coach could only watch in horror as his side were ripped apart in a third defeat in six Premier League games.
Losing 3-0 at home to Bournemouth was one of the lowest points of last season but 12 months on, under new ownership and new management, Manchester United were once again ripped apart by Andoni Iraola's dynamic and relentless Cherries.
In what is becoming an increasingly predictable turn of events, United conceded the opening goal from a set piece as Dean Huijsen headed in from a free-kick in the first half. The Red Devils rallied at the end of the half as Bruno Fernandes was on a one-man mission to rescue Ruben Amorim's side but Bournemouth came out even more determined in the second half and in the space of two minutes tripled their lead.
The usually level-headed Noussair Mazraoui dived in and fouled Justin Kluivert, who scored from the resulting penalty. Moments later Bournemouth sliced their way through the hosts defence and Antoine Semenyo smashed past a hapless Andre Onana, inflicting a third defeat in six Premier League on Amorim which was also his heaviest loss so far.
GOAL rates Manchester United's players from Old Trafford…
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Andre Onana (5/10):
Didn't get close to any of the goals and his slowness to get the ball out of his hands wound up United fans.
Noussair Mazraoui (4/10):
Was looking solid and United's best defender until he lost his head and dived in on Kluivert, effectively throwing the game away.
Harry Maguire (5/10):
A big comedown from his imperious performance against City.
Lisandro Martinez (5/10):
Given a tough time by Semenyo. Played some good passes but they came to nothing.
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Diogo Dalot (5/10):
Worked hard but didn't have much impact on either wing.
Manuel Ugarte (5/10):
Struggled to move the ball around the pitch with any fluidity. Hooked early as he was on a booking.
Kobbie Mainoo (6/10):
One of the few United players to look up for it. Was driving forward and dribbling around defenders with purpose, threatening to equalise before dropping off in the second half.
Tyrell Malacia (4/10):
Gave away the free-kick leading to the first goal. Had some promising combinations with Zirkzee down the flank but they led to nothing.
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Amad Diallo (5/10):
Managed to make a few things happen but lacked the magic he produced at the Etihad Stadium.
Joshua Zirkzee (4/10):
Lost Huijsen for the goal. Lost the physical battle and couldn't make much happen. Predictably removed early in the second half.
Bruno Fernandes (6/10):
Tried to be the hero and took matters into his own hands with three shots in the first half. Desperately needs more help from his team-mates.
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Leny Yoro (5/10):
Misplaced a few passes and was twisted inside out in build up to the second goal.
Rasmus Hojlund (5/10):
Had some nice combinations and flashed two shots wide.
Alejandro Garnacho (5/10):
Bungled a clear opportunity on the break by shooting straight at Kepa.
Ruben Amorim (4/10):
The honeymoon is officially over. Starting Malacia was a bad move and his changes made things worse. He has fewer points from his six Premier League games (seven) than Erik ten Hag had in his last six.