(CNN)Brazilian football player Alex Apolinario has died at the age of 24, his club FC Alverca said in a statement Thursday.
Alverca said Apolinario collapsed in the 27th minute of the club's Portuguese third division match against UFC Almeirim on Sunday, after apparently suffering a cardiorespiratory arrest.
"It is with deep sadness that we report, in accordance with the information provided by the medical staff of the Vila Franca de Xira Hospital, the passing by brain death of our athlete Alex Sandro dos Santos Apolinário, this morning," Alverca tweeted on Thursday.
"FC Alverca Futebol SAD will provide all the necessary support to his relatives. At this time of mourning all of FC Alverca activities are canceled."
According to the United Kingdom's National Health Service, brain death is "when a person on an artificial life support machine no longer has any brain functions."