Former Brazil international, Marcos Evangelista de Morais, known as Cafu has lost his son who suffered a heart attack while playing football with friends on Wednesday.
The news was confirmed by Cafu’s former team-mate and friend Paulo Sergio.
Reports in Brazil suggest Danilo Feliciano de Moraes, 30, had complained of feeling unwell after playing for just ten minutes at Cafu’s family home in Sao Paulo.
He was then rushed to the city’s Albert Einstein Hospital, but passed away despite efforts to revive him.
He was the oldest of three children of the 1994 and 2002 World Cup winner.
Sao Paulo, where Cafu, 49, started his career, sent a message of support to their former player.
“Sao Paulo Futebol Clube deeply regrets the death of Danilo, son of Cafu.
“The club sympathises and wishes the tricolor idol, family and friends a lot of strength.”
Another former club Palmeiras added: “The Palmeiras Sports Society mourns the death of Danilo, son of Cafu, and expresses condolences to the world champion and his family.”
Cafu made 142 appearances for Brazil and helped them to two Copa America titles.
At club level Cafu was a league champion with Sao Paulo before moving to Europe to join Real Zaragoza, where he won the European Cup-Winners’ Cup in 1995.
He spent six years at Roma and won the Serie A title in 2001, and joined AC Milan where he won the league title in 2004 and the Champions League in 2007.