Career
Early career
Kolev started to play football in CSKA Sofia"s youth teams. In June 2007, English side Reading officially invited Rosen to join the training sessions of their U-19 team for one week. Kolev"s professional career started in 2008 but during that season he didn"t make an appearance for the first team and in January 2010 was sent on loan to B PFG side Bdin Vidin.
Rosen made his debut for Bdin on 27 February 2010 in a 1–2 away loss against Balkan Botevgrad.
Kom-Minyor
In June 2010 his contract with CSKA was mutually terminated and Kolev joined Kom-Minyor. He made his Kom-Minyor début on 31 July 2010 in the away game versus Chavdar Byala Slatina.
Kolev got his first goal on 11 September, in a 2–2 home draw against Septemvri Simitli. Botev Plovdiv
Kolev joined Botev Plovdiv on 11 July 2014.
Kolev did not play in any official games in 2015 and on 25 May his contract with Botev was mutually terminated.
Kolev left the team after playing in 11 games.
