In the 30th minute, the star referee strangely performed a 360-degree turn while the game was in flow.
He randomly spun his whole body for no apparent reason in a hilarious sequence which didn't go unnoticed by fans on social media.
What is Mike Dean doing here?? :joy::joy: pic.twitter.com/wDE0tCwkwc- Darren Harris :soccer::trophy: (@Dazzler2207) April 17, 2021
Someone needs to check up on mike dean :sob: pic.twitter.com/G42onAsbvK- Joseph (@josephtoconnor) April 17, 2021
One wrote: "Had to be a bet/dare with his mates surely."
A second said: "Someone shouted ref so he looked around is my best guess."
A third added: "The man's so weird. He doing a 360? Lmao."
A fourth commented: "There are just no words for this man anymore."
Though his decision did not prove costly as the Blues beat the Premier League leaders 1-0 to book a spot in the final.
Hakim Ziyech struck in the second half after being put through by Timo Werner.
Thomas Tuchel's side will face the winner of Leicester vs. Southampton in the FA Cup final on May 15.
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