The sad news was also reported by the BiH news site Klix that “his doctors fought unsuccessfully for his life”.
It is reported that the center-back “suddenly collapsed during training” after suffering a “heart attack”.
Cacic started his career with youth teams in Rijeka, made a stint in Italy with lower league team Isernia, before ending up at NK Nehaj, based in the town of Senj.
They play in the second level of the football league system in Croatia.
Tributes poured into the Facebook post for the young man.
Zoran Meter wrote: “I do not know this boy or his parents, but I cannot hide my tears in the face of this tragedy. Sincere condolences to the parents.”
Robi Fonovic added: “Rest in the peace of God”, and Sandra Biondic Furrier asked God to give the family “the strength to endure this great sorrow and this pain”.
Another of his former clubs, the Bosnian club NK Jedinstvo, also paid tribute to Cacic by writing on his website: “Rest in peace, Sailor, forever in our hearts”.