Only days after chairman Karl-Heinz Rummenigge reiterated that they intended to keep him and that their refusal to discuss a transfer fee was not a way of pushing the price up, Beckenbauer has contradicted him by admitting that a sale is an issue.
His words will come as an invite to Chelsea, Manchester United, Barcelona and Real Madrid to commence an auction for his services.
"We discussed the issue at our last board meeting and we all agreed that, if he really wants to leave, then we will deal with the issue," Beckenbauer told Sport Bild magazine.
Rummenigge has already confirmed that Chelsea, United and Barca have discussed a fee with them only to be told that the 26-year-old would not be sold.
And according to reports in Spain today, Real Madrid have stolen a march on their rivals by offering Rafael van der Vaart and Wesley Sneijder as makeweights in the deal.
Both players are believed to be high up on the wishlist of new Bayern coach Louis van Gaal and obtaining the Dutch pair could tempt Bayern into listening to an offer for their unsettled midfielder, who has made no secret of his desire to leave the club this summer.
An additional cash fee could then be invested in one of Bayern's other two targets - Chelsea full-back Jose Bosingwa or Schalke goalkeeper Manuel Neuer.