And the club are set to report the German giants to FIFA over the possible transfer of Callum Hudson-Odoi.
They will look to see if there is a chance that Bayern have been tapping up the English youngster.
And Goal.com suggests if they find evidence, they will take it to FIFA.
Hudson-Odoi has been the subject of several offers from Bayern this winter, but Chelsea want to keep their star.
Even Bayern sporting director Hasan Salihamidzic said to reporters they were interested in Hudson-Odoi.
"He's a very interesting player that we really want to sign," Salihamidzic said.
"He has qualities that suit our game. He's a strong dribbler, fast, and carries a goal threat."