GK: Ter Stegen, young and world class, so his back-up is not so important (Farinez is rumored)
LB: Alba as an offensive LB, Cucu is a perfect backup for him (La Masia, offensive LB, proven his skills at Eibar)
LCB: Umtiti vs Lenglet, difficult to say who will be better at the moment
RCB: Pique vs De Ligt, maybe after one season De Ligt can replace him and Pique retires after another season (he also retired from National Team a while ago)
RB: Semedo vs Roberto, different player styles so let's see who will fit better

DM: All four players fighting for playtime, but I think Arthur will replace Rakitic and de Jong Busquets in 1 or 2 seasons. But e.g. Busquets AND de Jong is also possible
CAM: Coutinho showed his abilities at Copa America, if he plays at CAM, he could be awesome! Alena is not a 1:1 replacement right now,
better to change formation and another DM comes from the bench
LW: Griezmann as an Left Striker, Dembele comes from bench as either LW or RW
ST: Suarez, Griezman as backup (With Dembele as LW)
RW: GOAT for some more years playing as a right CF, Malcom was a stupid transfer, he will only get playtime when one of the others is injured

Vermaelen, Boateng, Murillo, Cillessen, Rafinha, Denis, Gomes and Vidal(another stupid transfer from Bartomeu) leave the club. It's also fine to sell Umtiti or Lenglet if de Ligt comes.
The talents Wague, Ruiz, Todibo on loan