Tottenham boss Mauricio Pochettino was furious with Heung-min Son's dismissal in their draw with Everton.
The 1-1 draw was overshadowed by Andre Gomes' horrific injury in the second half - after he was challenged by Son and collided with Serge Aurier.
Son originally received a yellow card from referee Martin Atkinson before it was upgraded to a red after the seriousness of the damage to Gomes was revealed.
While there wasn't an official VAR check, he was given guidance in his ear from officials in Stockley Park to show a red card.
It is unbelievable he received the red card. if it's not up to the refs then we are in a big mess, it is going to change the spirit of football," said Pochettino.
"VAR changed the game because it changed the yellow card to red. it is creating a big mess. It was very very tough, completely unfair for Son, complete unfair for Tottenham very difficult to understand this type of situation.
It was clear it was never the intention of son to create the situation afterwards.
I don't know if we will appeal the red card, i don't know if it is possible, but will it change it, because what we can't change all that happened after the red card."
