The 31-year-old, who is the Balkan country's all-time leading scorer with 48 goals, quit Bulgaria in 2010 and has repeated several times since then that he had no intention of changing his mind.
"You should receive an invitation to return somewhere," Berbatov told Bulgarian sports website www.sportal.bg.
"My phone is switched on and I can be more concrete if I receive an invitation.
"No one has tried to contact me. I haven't met [Bulgaria coach] Lubo Penev and I haven't talked to him. I couldn't even congratulate him on his appointment."
"I'll talk to him this week and I'm optimistic," the coach, whose first match in charge is a friendly against Hungary on February 29, told Bulgarian state television.
"I think this is the right time for such a meeting."
Bulgaria captain Stilian Petrov broke his four-and-a-half media silence in October to urge Berbatov to consider returning to the national team because they need their "most talented player."
