After Germany had exited the World Cup during the group stage, Muller has said in an emotional statement that he has played his last match for Die Mannschaft.
Muller has been capped 121 times for Germany, scoring 44 goals.
But now things appear to have now changed with the 33-year-old confirming at a press conference that he is available for German national team selection if needed by coach Hansi Flick.
"I was emotional after the Costa Rica game, of course. It was a sad moment, especially because we were eliminated even if we won the game," Müller told a press conference.
"I've been in good communication with Hansi [Flick]. As long as I am a professional footballer, I will always be available to the national team.
"It's up to the coach to decide when, if and how. The goal is to be successful again. Hansi has many options in attack. I'm very relaxed, but will absolutely be there when the coach needs me," Muller added.