Career
He played his last match in his career on 13 June 2009 with Lokomotiv Sofia against Slavia Sofia. On the club level, Koilov has played for Botev Plovdiv, CSKA Sofia, Lokomotiv Sofia, Football Club Lucerne and Union Berlin. Foreign Berlin club 1. Football Club Union he played from 1999 to 2003, when he was in the successful team that surprisingly reached the German cup final in May 2001 and afterwards the second round of the.
In 1993 Koilov earned his first and only cap with Bulgaria.