One of the biggest - and I mean huge - problems that we have at the moment is Foden.
Gibbs-White Reijnders would be excellent to take over KDB (with Reijnders also capable of performing Gundogan's role), getting Wirtz in would leave Foden out of the team (as they both play in the same position, and Foden wouldn't - IMO - be a capable replacement for either KDB or Gundogan).
Now we'd obviously be loathe to do that based on the fact that he's had one terrible (yes, I said it) season, but we can't either have a repeat of what has gone on this season and hope to compete for the PL or CL).
It'll be very interesting to see - if we did go bonkers and try for all 3, or even just Wirtz & MGW - who Pep chooses to re-position, and where.