Will these prospects follow up exciting debut LaLiga seasons by establishing themselves at the likes of Real Betis, Sevilla and Villarreal?
Uruguay great Diego Forlan, who played for Manchester United and Atletico Madrid, has retired.
Manchester United now have two of the nine most expensive defenders of all time after buying Harry Maguire from Leicester City.
Marseille have strengthened their suspect defence with the addition of the experienced Alvaro Gonzalez.
Russia winger Denis Cheryshev has sealed his permanent move to Valencia, where his contract includes an €80million buyout clause.
After becoming a free agent following his release by Liverpool, Alberto Moreno has been snapped up by Villarreal.
Full-back Aaron Wan-Bissaka's move to Manchester United has made him one of the most expensive defenders of all time.
Russia winger Denis Cheryshev is set to return to Valencia as he brings an end to his time at Villarreal.
Villarreal midfielder Pablo Fornals, a Spain international, has completed his move to Premier League side West Ham.
Spain international Santi Cazorla will continue playing for Villarreal in 2019-20.