So, about Manchester United's 1-1-1-1-3-3 formation.
United's back line formed a bizarre defensive formation when Leroy Sane ran in for Manchester City's second goal.
Matteo Darmian, Chris Smalling, Victor Lindelof and Jesse Lingard produced a 'vertical back four' in a hilarious moment.
Social media immediately noticed United's 'tactical innovation' including Twitter user James Nalton.
"The vertical back four. Tactical innovation, Man United style," he wrote accompanied with a picture of United's defence.
"Good to see us popularise the 1-1-1-1-3-3 formation tonight, fire performance lads," another Twitter user wrote.
Fans have hilariously broken down United's 1-1-1-1-3-3 formation. Here's some reaction from Twitter:
Meanwhile, Manchester United remain in sixth place with 64 points on the board following their 2-0 defeat to Manchester City.
They have three league games left as they aim to secure Champions League football for next season.
The Reds resume their league campaign against Chelsea on Sunday.
Will United sneak into the top four? Let us know what you think.
Featured Image Credit: Sky Sports