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Oh, and not to mention the unsteady back four of Chris Smalling, Phil Jones, Jonny Evans and Patrice Evra.
It was a humiliating day from start to finish for The Gunners, who originally fielded a relatively strong starting XI.
The likes of Robin van Persie, Aaron Ramsey and Laurent Koscielny featured but it wasn't enough.
Wayne Rooney scored a hat-trick, Ashley Young smashed in two long-range efforts while academy graduate Danny Welbeck, tricky winger Nani and the hard-working Ji-Sung Park found the scoresheet in an 8-2 rout at The Theatre Of Dreams.
Months earlier, Ferguson fielded an even weaker side in their FA Cup quarter-final against Arsenal, naming Brazilian brothers Rafael and Fabio in midfield.
John O'Shea pulled the strings in midfield as United opened the scoring through Fabio in the 27th minute, before Wayne Rooney sealed the tie just four minutes into the second half.
Plenty doubted the strength of United's line-up before kick-off and you can understand why.
The likes of Jack Wilshere, Samir Nasri and Laurent Koscielny couldn't stop United from securing victory, but is this the worst midfield United have ever fielded?
Sir Alex was blessed with some of the world's best players during his time at Old Trafford.
From Cantona and Giggs to Scholes and Keane, but in 2007 the newly-crowned Premier League champions fielded another weakened team, this time against Chelsea.
The likes of John Terry and Claude Makelele lined up before-kick off to give Sir Alex Ferguson's side a guard of honour, as captain Gabriel Heinze led his team out.
It was a bizarre spectacle. Plenty of outlets reported that these teams were weakened because of the forthcoming FA Cup final in mind, but it was most likely a ploy by Sir Alex to make a spectacle.
Dong Fangzhou, who's time at Old Trafford was far from eventful, managed to get a rare game, but was brought off with 18 minutes to go after failing to get the better of Chelsea captain John Terry.
Kieran Lee and Chris Eagles also 'earned' starts in a forgettable 0-0 draw at Stamford Bridge.
That being said, Sir Alex's decision to field these unusual sides will forever remembered.
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