Dinamo Bucharest and Cameroon midfielder Patrick Ekeng died on Friday after collapsing on the pitch during a match for his club.
Ekeng, 26, fell to the ground shortly after coming on as a 62nd-minute substitute during a league match against Viitorul Constanta, his club said in a statement on their website.
Media reports said he suffered a suspected heart attack and was pronounced dead in hospital two hours later.
"Dinamo lost tonight, forever, footballer Patrick Claude Ekeng Ekeng," Dinamo said.