Well I would say Ugochukwu, Lavia, Caicedo and Santos are more defensive mids and if Palmer wants to play centrally then those players would be in competition with each other and not Palmer.
I think we are kind of overloaded in certain positions. DM is one of them, maybe CB if everyone is fit. But beyond that, I think we have a healthy number of players for each position.
Wingers: Sterling, Mudryk, Madueke and now Palmer.
Strikers: Jackson, Broja, potentially Nkunku if needed and Burstow, Fofana (when he returns from loan).
Attacking mids: Nkunku, Chukwuemeka
Midfielders: Enzo, Gallagher potentially Palmer if needed, Caicedo at a stretch
Defensive mids: Caicedo, Lavia, Ugochukwu, Santos (when he returns from loan)
CB: Silva, Colwill, Disasi, Badiashile, Fofana (out for a season), Chalobah (being sold), Humphreys (will go on loan).
RB: James, Gusto.
LB: Chilwell, Maatsen
GK: Sanchez, Petrovic.