Dimitar Berbatov has refused to rule out the possibility of coming out of international retirement with Bulgaria.
The Manchester United striker has not represented his country since calling time on his national career in 2010.
However, the 31-year-old has insisted that he is willing to listen to any advances from the Bulgarian Football Association.
"You should receive an invitation to return somewhere," Berbatov told Sportal.
"My phone is switched on and I can be more concrete if I receive an invitation."
Berbatov has made 77 appearances for Bulgaria, scoring 48 goals in the process.