He was the top goalscorer of the Bulgarian "A" Professional Football Group in 2001–2002 season with 21 goals netted for CSKA Sofia.

[3] In the last match for the autumn period of the 2008–09 season against Lokomotiv Mezdra he received an injury in his knee ligaments, which prevented him from playing football for about nine months.

On 30 August 2009, Manchev scored the third goal in the 4–0 home win against Lokomotiv Mezdra in his first game back from injury after coming on as a substitute for Rui Miguel.

Although he was injured most of the 2008–09 season, in which he played only four matches, he scored four goals and made a few assists, so on 16 June 2009 it was said that in the next few days he would sign a new contract, which would make him a CSKA player for the next two years.

In the summer 2010 Manchev was transferred to Akademik Sofia, but did not make any appearances in official matches for the team.