He made his league debut for KF Tirana on 8 December 2007 against KS Skenderbeu Korce, Hajdari came on in the 63rd minute for the veteran Nevil Dede.

Hajdari played 12 games in the NPSL league where the Red Bulls was part and scoring 9 goals.

He was selected by coach Edmond Licaj to be tested for the Albanian U-17 team on 13 September 2006, whilst still playing for KF Partizani Tirana.

[10] Blerti Hajdari was selected by coach Artan Bushati for the Albanian U-21 team for the match against Azerbaijan on 5 September 2009 in Durrës.

He was chosen as part of the 23-man squad along with fellow KF Tirana players Migen Metani, Ditmar Bicaj and Albania U-21 captain Erindo Karabeci.