#4 Mateo Kovacic
When you see Mateo Kovacic having a good day on the field, you can't help but think about how much he could be contributing to a team that demands top performances from him on a regular basis.
In a midfield that has stalwarts like Luka Modric, Casemiro, Toni Kroos and Isco, Mateo Kovacic plays a bit-part role. He has appeared a mere 19 times for Zinedine Zidane's men in the La Liga this season and 10 of them have come from the bench.
Kovacic is a well rounded player and has all the qualities to make it big at a club that's not as star studded as the current Real Madrid team is. With Karim Benzema reaching his twilight days, Real Madrid have been looking at Harry Kane as a replacement.
In that case, they should look to make Mateo Kovacic as a make-weight in the deal to lure Kane to the Bernabeu. It would work out well for both Real Madrid and Kovacic.