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 the 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).

Giorev left Valletta at the end of season 1990-91, with the Lillywhites, he played a total of 44 matches and scored three goals.