France, April 6 -- Former footballer Didier Drogba joined South Africa's rugby World Cup-winning captain Siya Kolisi and Olympians Marlene Harnois and Masomah Ali Zada in Paris to launch the 2024 white card campaign as part of the celebrations on Saturday for the international day of sport for development and peace.

"Everyone has to pass on the message of peace to everyone in their circle," said Drogba during a conference at Unesco's headquarters.

"And you've got to want to believe in what the message is about," added the former Chelsea star.

The white card campaign - created by the independent organisation Peace and Sport - urges people to post a picture of themselves on social media holding up a card just like a football referee.