Pogba is not really what Real Madrid should be looking for, he is a good player but he is both a bit emotional and always gets injured as well.
Pogba is good but not too good as social medias tell about him.
I think a better player for Madrid could be Kante like previously mentioned, dude has a high motor, constantly runs, be at the offense when attacking and be at defense when defending so much that he almost always has a shot at being the "player with most distance traveled" when the game ends, that is the type of player they should aim at.
Kante is a very good midfielder. He is the greatest defensive midfielder after the legendary defensive midfielder, who comes from France too, Claude Makelele. The minus point for Kante if any club want to make a transfer with him is he has become older and does not have too much time playing at his best physical conditions.
If they want more talent and flair instead of just high motor or dedication, they could potentially look for somewhere closer to Modric style but I feel like they have enough talent on their team, they probably just need some sort of hard worker and even maybe a bit aggressive.
Modric, how to find a good alternative for him? I don neither know nor maybe the Real Madrid's president -- Florentino Perez.
I would say Arturo Vidal would have been perfect for them but he is at Barcelona.
Arturo Vidal is an old guy too and Real Madrid does not need such a player like him, in the very long plan.