Former Premier League referee Mike Dean failed to correct a mistake in a match to save his friend and fellow official Anthony Taylor from extra "grief".
Dean was the video assistant referee (VAR) for Chelsea's 2-2 draw with Tottenham in August 2022.
Just before a late Harry Kane equaliser Chelsea felt they should have had a penalty after Cristian Romero pulled Marc Cucurella's hair.
Dean acknowledged a "really bad call" not sending Taylor to review it.
"It's one of them where if I had my time again, what would I do? I'd send Anthony [Taylor] to the screen.