#4 Marco Asensio

The 20-year-old hasn't been the most consistent player this season, but if anybody is to fill the void left by Cristiano Ronaldo, it's the young Spaniard.
In the last two El Clasico meetings, Marco Asensio made his mark by scoring in each. He's beginning to thrive into a mature player, and in the absence of Ronaldo, Asensio is only going to get more game time and grow as a player.
If there's anyone who the Barcelona defence should be looking to isolate, it's Asensio, because whenever he is given the license to roam, he's deadly. We have witnessed this with the Spain national team, as well as Madrid this season.
He's only scored one goal and provided one assist this season, according to WhoScored, but if he's to add to his tally, it better be against Real Madrid's long-time rivals.