Since it seems we are likely to have PEH and Ndombele as two starters in our MF I would look at going with a 4-3-3, or maybe a 4-1-2-3, system and bring in a player like Thiago (I love him so always use him as an example) to play in the middle, deeper than the other two to control things from the center and allow PEH to run around as needed and Ndombele to move up to the front 3 as needed. Similar to the role Frenkie De Jong played for Ten Hag at Ajax. It leaves us without a traditional DM but one lof the things that has driven me nuts is our lack of control of the ball in the MF, so bringing in someone who can dominate the ball in the middle, break the press with long balls over the top, dribbling past guys or short passes we would be better off.