Benfica's Hungarian international striker Miklos Feher has died after collapsing during a game on Sunday.
Feher won 25 caps for Hungary
Feher suffered a heart attack during the league game between Benfica and Vitoria Guimaraes.
The 24-year-old was stretchered off the pitch and taken to hospital after he collapsed unconscious.
The game was stopped for 15 minutes as team doctors tried to resuscitate the player but he later died in hospital.
Fausto Fernandes, the clinic director of the Hospital da Senhora da Oliveira said in a statement: "At 2145 [local time] Miklos Feher, 24, was brought into emergency care with a cardiac arrest.
"Immediately, all emergency measures were taken. This lasted until 2310, without success, when the player was pronounced dead.
"The body of the unfortunate player will stay at the hospital where it will undergo an autopsy on Monday."
A minute's silence is expected to be observed before next weekend's matches in the Portugese league.
"We are all in deep shock and would first like to address his family and send our condolences," said Benfica spokesman Antonio Cunha Vaz.
"All the Benfica board and supporters are mourning our athlete, Miklos Feher."
Feher, who won 25 caps for Hungary, moved to Benfica in 2002 after four years at FC Porto, including loan spells at Salgueiros and Braga.