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As the pair tussled for the ball moments into the second half at White Hart Lane, the Spurs man fell to the floor.
The Blades midfielder then left his right foot on the face of the Argentine who was left writhing around in agony.
Replays showed that Fleck caught Lo Celso on the head with his boot. Depending on which team you support, that was either completely accidental or very naughty.
VAR reviewed it, but decided it was unintentional and - amazingly - there were no repercussions for Fleck.
To add fuel to the fire, VAR later ruled out a Son Heung-min effort for offside.
Spurs won the game 4-0 against the already relegated Blades. Gareth Bale hit a hat-trick and Son added a late fourth.
:rage: What Is Var?!#THFC #COYS #TOTSHU pic.twitter.com/H68JoKC1wo
- Last Word On Spurs:microphone2: (@LastWordOnSpurs) May 2, 2021
That's a red card. Obvious stamp from Fleck on Lo Celso's head. Disgusting challenge.
- The Spurs Web :white_circle: (@thespursweb) May 2, 2021
well done VAR officials. You can tell when someone is offside by 4mm, but not when John Fleck deliberately stamps on another player's face.#TOTSHU
- Jon Barbuti (@jonbarbuti) May 2, 2021
Son is 0.5 millimeters offside: VAR says no goal. Fleck stamps on Lo Celso's head VAR says carry on chap, it's all good! #TOTSHU
- Jake Eadon (@Eadonj) May 2, 2021
Meanwhile, Tottenham's rivals Arsenal have been more negatively affected by VAR than any other team in the Premier League this season.
ESPN FC's Dale Johnson has done a full review of the top flight's VAR stats this season and revealed that only two goals have been overturned in the Gunners' favour up to now, the lowest of anyone.
Arsenal are also second in the table when it comes to decisions being overturned in the opposition's favour.
Nine times the Gunners have seen their opponents have a decision in their favour overturned, second only to Liverpool.
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