Referees' chief Howard Webb says Michael Oliver was wrong to send off Arsenal's Myles Lewis-Skelly during their Premier League win at Wolves.
Arsenal were fined £65,000 for failing to control their players during the incident in which 18-year-old Lewis-Skelly was shown a straight red card for a foul on Matt Doherty in a 1-0 win at Molineux on 25 January.
Video assistant referee (VAR) Darren England upheld referee Oliver's decision that Lewis-Skelly committed serious foul play.
The Gunners appealed against the decision and the teenager's three-match ban was subsequently overturned.
Former England captain Alan Shearer, speaking on BBC Match of the Day, said at the time the sending-off was "one of the worst decisions I've seen in a long time".