[3] He made his league debut against Slivnishki geroi on 14 March, playing the full 90 minutes.

Pirgov finished the season with 10 appearances, as Pirin clinched promotion to the A PFG.

[4] After playing for Levski Sofia for two years, Pirgov signed a contract with Botev Plovdiv on 23 January 2018.

[6] He was called up to the senior Bulgaria squad by Ivaylo Petev for a 2018 FIFA World Cup qualifier against Luxembourg in September 2016.

[7] Pirgov earned his first cap on 7 October under Petev's successor Petar Houbchev, playing the full 90 minutes in the 1:4 away loss against France in another qualification match for the 2018 World Cup.