CSKA, who finished third in the domestic league, had withdrawn from the tournament due to serious financial problems.
The two-times Bulgaria's top flight A Group champions Botev, who finished fourth in the Bulgarian championship, will meet Kazakhstan's Astana in the Europa League's first preliminary round on July 4 and 11.
"We would like to thank the BFU for its efforts," Botev coach Stanimir Stoilov told local media. "It's good that Bulgaria will be once again represented by four teams in Europe.
"Our players are ready for the challenge and I think we'll delight our fans with our performances (in the tournament)," Stoilov added as Botev reacted quickly to strengthen their squad by signing Slovenian defender Elvedin Dzinic from Belgium's Charleroi.
- Sports & Recreation
- Stanimir Stoilov