If he said Kyle Walker is an irreplaceable player this means he won't allow Walker to leave Manchester City for Bayern Munich or any other team even if they sell this player finding another good player to fill his place can't be easy.
That's why pep said on his interview if he wanna fight against bayern in defending kyle to stay in the club even longer. City needs more effort to do that caused by walker already reached pre agreement with bayern.
I prefers him to stay in manchester city. Walker shall see how guendogan played with barcelona. He was nos suit for the club. Kyle walker will able to earn more trophies with manchester city instead of moving to the club with less chance than city.
He will have the same fate as guendogan. I hope walker gonna realize it about how important him for manchester city at this moment.
I strongly disagree if he will be moving to the bayern. City is far better for him at this moment. City may also offer him a new contract.