#2 Jose Gaya - Valencia
Jose Gaya has been linked with a move to Arsenal in the past, so The Gunners will know all about him. He is essentially Monreal 2.0, and I don't say that just because they are both Spanish. Gaya loves to bomb forward whenever he has the chance, something Monreal has become accustomed to in recent seasons.
Gaya has plenty of time to grow under Unai Emery. He is just 23, which may attract The Gunners to him. He already has some international experience while playing on big stages a few times in his career.
Undoubtedly, playing against Cristiano Ronaldo and Lionel Messi would have taught him a thing or two about how to defend. His experience may have served him well in LaLiga, but whether or not Unai Emery is tempted by Gaya remains to be seen.