I mean, if we get Haaland AND Mbappé, even Benzema's role can be questioned. Hazard has to go for sure.
What formation do you play?
2 forwards and Mbappé plays like a false 10 behind them (the Griezzman role on the National Team)... but that's not exploiting one of Mbappé's greatest strength (speed). Mbappé on the wing? If you play a 4-3-3 that can work, but if you play 4-4-2, do you really want him on the wing?
And then, what do you do with Vini? He seems to be having a break out season. Playing much better, finishing at a higher rate. Less lost balls. He is also very young and theoritically be part of the new core... or he could go back to being a very frustrating player to cheer for.
I guess you could try something like:
Benzema - Haaland
Vinicius - Valverde - Camavinga - Mbappé
But then, you are basically playing a 4-2-4 in front of a weak defense and the two midfielders you are using are more offense-oriented. That team would be VERY vulnerable on the counter and could lose midfield battles. Vinicius on the left does not worry me, I put in a lot of defensive work. Mbappé can do it too. You want these guys to score goals, not spend their time defending though. I dunno.
I mean, even if we can afford to get both of Haaland and Mbappé, is it wise? I guess you just relegate Benzema to a lesser role if you can pull that heist off... but he is our best player and a club legend. Maybe that's my heart talking, I really dunno. I guess we'll cross that bridge if we ever get there. 1st-world problems, I guess