Career
In his career Donkov played for Levski Sofia, Botev Plovdiv and CSKA Sofia. He played also in Germany fot VfL Bochum, 1. Football Club Köln, South Carolina Paderborn 07, SV Waldhof Mannheim and FSV Oggersheim, in Switzerland with Neuchâtel Xamax, and in Cyprus for Enosis Paralimni.
International goals
On 9 June 2010, Donkov was named as the new assistant coach of 3.
Liga club SV Wacker Burghausen.