It has been reported that with the arrival of Mbappe to the side, Los Blancos president, Florentino Perez wants the Frenchman to play alongside the likes of Jude Bellingham, Vinicius Junior and Rodrygo, instead of replacing one of them. As per Football Espana, the onus has fallen upon Carlo Ancelotti, who has three possible variations going forward.
The first possible answer to the question has been playing with a 4-3-3 formation where Mbappe would be the central figure with the two Brazilians on the wings and Bellingham dropping into a three-man midfield.