[3] At Neftochimic, he became a member of the first team and his goals helped the "Sheikhs" gain promotion to the A PFG during 2012–13 season.

He made 23 appearances, finishing as the club's top scorer with 14 goals.

Petkov made his A PFG debut on 21 July 2013, when he came on as a half-time substitute in a 4–1 away loss against Litex Lovech.

[4] He scored his first goal for the team from Varna on 13 September 2014, netting a late equalizer in a league match against CSKA Sofia.

This biographical article related to association football in Bulgaria, about a forward, is a stub.