The 28-year-old's attempts to send a defiant message to his critics on that day at Wembley were labelled "embarrassing" by Roy Keane, who went on to slam Maguire's club performances as a "disgrace".
Well, things didn't exactly go to plan for the England international on Saturday afternoon. Just five minutes after picking up a yellow card for hauling down Ismaila Sarr, United's captain was sent for an early bath.
:camera_with_flash: - Maguire, the man who put his fingers in his ears after scoring vs Andorra one week ago, once again let's his team down and has to go off with a red card. pic.twitter.com/xNA4EQyphP
- :gem: (@TheEuropeanLad) November 20, 2021
He dawdled on the ball in the 69th minute and as a result, Watford midfielder Tom Cleverley took advantage. Moments later, Maguire brought him down and referee Jon Moss had no other option but to send him off.
United manager Ole Gunnar Solskjaer then proceeded to high-five Maguire as he made his way down the tunnel.
The high five between Ole and Maguire has finished me :sob: pic.twitter.com/ap3FHs7qU6
- Has the Referee or VAR made a poor decision? (@PoorEPLreferees) November 20, 2021
Solskjaer high-fives Maguire. God knows why. Maguire overruns the ball, Cleverley intercepts and is clattered. Clear second yellow. Maguire actually had a good first-half but the panicky play has returned this half.
- Samuel Luckhurst (@samuelluckhurst) November 20, 2021
It was another day to forget for Solskjaer's men, who went 2-0 behind at half-time after goals from Joshua King and Ismaila Sarr.
Donny van de Beek, a bright spark in the game after coming on as a second-half substitute, gave United hope with a close-range finish but they conceded twice in the final minutes as Joao Pedro and Emmanuel Bonaventure secured a 4-1 win.
The Reds now sit seventh in the Premier League, 12 points behind leaders Chelsea.
Ole Gunnar Solskjær holds his hands up to the away Manchester United fans after they're thrashed 4-1 at Watford pic.twitter.com/pTzaPHjh2l- Sky Sports News (@SkySportsNews) November 20, 2021
Harry Maguire after the game pic.twitter.com/4p04gDUTEb
- Project Football (@ProjectFootball) November 20, 2021
Thoughts on that United performance at Vicarage Road? Is it time for Solskjaer to go?
Let us know in the comments.