[6][7] His talent was noticed by Litex Lovech scouts and as a result Tonislav moved to this club’s academy in 2010.

[11] He made his official debut for the team in a cup match on 22 September 2015 against Lokomotiv 2012 Mezdra.

Yordanov made his official debut for the team in First League on 31 May 2017 against Dunav Ruse.

[13] He signed his first professional contract with the team on 6 June 2017 alongside Slavi Petrov and Angel Lyaskov.

[17] On 5 September 2019, he scored three goals for the Bulgaria U21 team in the 4:0 away win over Estonia U21 in a 2021 UEFA Euro qualifier.