A statement on Dinamo's official Facebook page read: "Dinamo tonight lost footballer Claude Patrick Ekeng Ekeng forever.
"On behalf of all of Dinamo, sincere condolences to the bereaved family. God rest his soul."
Ekeng made his Cameroon senior debut as a second half substitute in the 1-1 draw against DR Congo in his home city of Yaounde last year.
"Cameroon and the great family of Cameroonian football are in mourning. Pending an official report on this tragic incident, we have lost a son and a brother.
"The president and the executive committee of Fecafoot present their sincere condolences to his family and relatives. RIP Ekeng Ekeng, RIP indomitable lion."
In 2003, another Cameroon midfielder, Marc-Vivien Foe, collapsed and died during an international match against Colombia.