England stars Raheem Sterling, Danny Rose and Callum Hudson-Odoi endured racist abuse from Montenegro fans during last month's Euro 2020 qualifier, while in the club game Inter Milan, Dinamo Zagreb and Dynamo Kiev have all been punished with full or partial venue closures due to racist behaviour by supporters.

"I am ashamed, ashamed that in 2019 we have to hold a conference to promote diversity," said Ceferin, at Wembley on Tuesday for the first Equal Game conference held to help tackle discrimination.

"It is worrying to see world leaders and politicians playing down racist and discriminatory incidents."

English football bosses are also ready to strengthen punishments against racism.

Football Association chairman Greg Clarke revealed the English game's governing body is reviewing disciplinary processes, to ensure claims of abuse are investigated more meticulously.

Clarke also revealed a review of training for match stewards on how to handle discrimination issues, with the FA keen to act after the abuse England players suffered in Podgorica.

"When Raheem Sterling, Danny Rose and Callum Hudson-Odoi speak with such maturity and eloquence, we must listen, we must respond -- and we must not let them down," Clarke said.

"Let me be clear, I'm using this match (Montenegro-England) as an example of something that's happening across all our societies, and across all of Europe.

"None of us can be naive enough to think racism doesn't happen at all of our countries and matches. Clearly more needs to be done.

"We must do more in England, and more across Europe, and we must do this together ... we must put some concrete actions in place."

Clarke believes it is time to re-examine UEFA's three-step process for halting matches as a result of racist abuse.

Current guidelines allow referees to stop, suspend or abandon matches due to racist abuse, but Clarke believes it is time to lower the threshold that allows referees to take that action.

"The protocol asks the referee to stop the match if 'racist behaviour is of a strong magnitude and intensity'," Clarke said.

"I don't now think that is good enough and we should take this opportunity to revisit these thresholds.