Muller has a contract with Pep Guardiola's side until 2017 after joining the German champions in 2000 as a youngster and rising through the ranks.
However, the Germany international has been linked with a switch to the Nou Camp at the end of the current campaign and believes that anything can happen in football.
"If you stay at the level we are playing at in this business then you are going to be sought after," he told Bild.
"There have been some interesting offers, but I know that Bayern is not a selling club.
"I really enjoy being at Bayern, but I am not going to make a declaration of loyalty and then tomorrow change my mind."
The 24-year-old added: "I feel good here, but I understand that in this game anything can happen quickly and can change from one week to the next.
"I must insist though that this is nothing negative against Bayern."