The Spain international previously stated that he's happy to stay at his current club, but now seems open to a move to the German top flight after all
The versatile midfielder has been linked with a move to both the Allianz Arena and Barcelona in the past few weeks, but recently stated that he intends to stay with his current club.
However, the 23-year-old has now supposedly set his sights on a move to the Bundesliga instead.
"He wants to go to Bayern, and Bayern are still interested in signing him," Akan was quoted as saying by Sport1.
"I know that they still want him, but the transfer fee is a problem. He's just waiting to see how things pan out, but he would like it if the transfer takes place. I'd say chances that it will go ahead are 50-50 now."
Martinez's contract with Athletic runs until the summer of 2016, and the Liga side have set a €40 million asking price for the midfielder.