Interesting problem - considering that we will still play 3-4-3 we now have 8 players for 3 positions: Havertz, Sterling, Mount, Pulisic, Werner, Ziyech, Broja, CHO.
Ziyech will propably leave so we still have 7 players. If Broja leaves and we bring another forward I think we will still have to get rid of one more player (Pulisic, Werner or CHO), 7 seems like an overkill.