Mike Dean has admitted an error in not asking referee Anthony Taylor to check his pitchside monitor after Cristian Romero's hair-pull on Marc Cucurella.
Dean, the video assistant referee, allowed the incident to go and Harry Kane equalised for Spurs seconds later.
"In the few seconds I had to study Romero pulling Cucurella's hair, I didn't deem it a violent act," he said.
Speaking to MailPlus, Dean added: "I've since studied the footage, spoken to other referees and, upon reflection, I should have asked Taylor to visit his pitchside monitor to take a look for himself.