Royal Antwerp have confirmed that youth player Joel Lobanzo has died following a cardiac arrest during a training session.
The 17-year-old became unwell during Under-19s training on Tuesday, with medical personnel attending to him, before he was transferred to hospital.
Lobanzo remained in critical condition in hospital but was pronounced dead on Thursday.
"We discovered this terrible news that Joel Lobanzo, a 17-year-old youth player from RAFC, died last night," the club statement said.
"The young football player had become a victim of sudden cardiac arrest during the training of the U19 on Tuesday night.
"The medical supervisor and trainers who were in the vicinity of the player immediately started the resuscitation, after which the MUG team transferred the player to the UZA in critical condition. The young man remained in critical condition for more than one day, but died on Thursday.
"At the time of this tragic event, some tens of young people were present in the training fields. For all witnesses of this awful incident - both fellow players, trainers and youth workers - the club has provided shelter and support since yesterday. Over the next few days this will be the case. This is further communicated internally."
Antwerp finished their statement with a request for Lobanzo's family and friends to be given privacy.