"I didn't expect such reaction," said Berbatov, an unused substitute in his team's 2-0 Champions League win over Otelul Galati at the National Arena in Bucharest.
"I can't play for the national team if I'm not playing for my club," he added, in a barely concealed plea to United manager Sir Alex Ferguson for more first-team football.
"I would like to thank the fans, it was very pleasant. My team-mates wondered what was happening and I had to explain them [about the noise from the stands]," added the 30-year-old.
Last season, Javier Hernandez overtook former Bulgaria captain in the pecking order to become Wayne Rooney's preferred strike partner at United.
"I want to get more chances because I know I can help the team," Berbatov said. "I'll continue to give my best to earn my place in the team."
