^
Kimmich and Goretzka. They had Martinez who played 24 games as a CDM. Now add to that they lost two starter CBs and only brought one.
They still have Marc Roca and Tolisso, the same as last season. They also have the very promising kid Musiala who can play CM and other positions. Javi Martinez didn't have that many minutes last season, the few appearances he had he actually played CB instead of CDM mostly, I think.
Boateng was not a big loss, he played a lot for them last season but he hadn't been that good for a while. CB-wise, they are more than covered, with Upamecano, Sule, Lucas Hernandes, Pavard, Nianzu and the American Chris Richards whom they recalled from loan from Hoffenheim. That's potentially 6 CBs, more than enough.
Bayern is more than fine in my opinion.