Career
In June 2005, he received a Bulgarian passport. Born in Radoviš, Kotsev start to play football in local club FK Jaka. When he was only 14 years old he went to Blagoevgrad, together with his compatriot Zoran Zlatkovski, which then his first club was Bulgarian side Pirin Blagoevgrad.
In the season 2007/08 Kotsev was loaned to Pirin Gotse Delchev and played one year in Bulgarian second division.
Lokomotiv Plovdiv
Kotsev signed with Lokomotiv Plovdiv on 26 July 2010 on a two-year deal. He made his debut on 31 July in a 1–1 away draw against Vidima-Rakovski.
