Borislav Gyorev was born in Sofia on June 16, 1956. In Bulgaria, he played with Adadewik Sofia 1974-1982. Varma Spartak 1982-86 and Pleven 1986-87. He was introduced in Maltese Football by Mosta FC in season 1987-88. Borislav joined Valletta FC in season 1988-89 as a midfielder. He made his debut with the Citizens in a match against Sliema Wanderers (0-1).
Gyorev left Valletta at the end of season 1990-91, with the Lillywhites, he played a total of 44 matches and scored three goals.