Mike Dean, the video assistant referee, has acknowledged that in Tottenham's 2-2 draw at Chelsea, Cristian Romero should have been sent off for pulling Marc Cucurella's hair.
Dean, the Stamford Bridge game's VAR, decided against imposing any penalties at the moment.
In stoppage time, Harry Kane scored an equaliser with a header from the ensuing corner.
"No referee wants to be driving home from a game knowing they should have made a different call," Dean wrote in his Daily Mail column. You may come to see your actions could have been different in retrospect.
"Before Harry Kane's second goal, I urged referee Anthony Taylor to hold off while I investigated the collision between Chelsea's Marc Cucurella and Tottenham's Cristian Romero.
"As VAR, I was unable to award Taylor a free kick, but I could suggest that he go to the referee review area to mull over a potential red card. I didn't think Romero tugging Cucurella's hair was violent in the brief time I had to observe it.
After seeing the video again and consulting with other officials, I realised that I ought to have asked Taylor to go to his pitch-side monitor and have a look for himself. The final decision is always made by the field referee.
It just goes to show that you can never stop learning, regardless of how much experience you have—and I've worked as a Premier League official for more than 20 years.
It's upsetting for me because, other from this event, our officials had a fantastic weekend.