#3 Ronald Koeman
It would be nostalgic to have a man like him to come back to the club. The scorer of the wonderful freekick that won Barcelona it's first European title back in 1992. A part of the famed Cruyff "Dream Team" Koeman would instantly raise the spirits of everyone associated with the club.
The former Barcelona assistant manager has carved out a respectable career for himself. The most experienced of the three here, the 55-year-old has managed 9 clubs in 4 countries and now manages the Dutch National team. 8 trophies in his cabinet, it may be time for him to finally manage one of the big boys of European football.
Currently, the Dutch side seems rejuvenated since he took over the reins back in February of last year. Since then they have topped their group in the UEFA Nations League in spite of being drawn with France and Germany. Getting the best out of the youngsters in the side like Matthijs de Ligt, Frenkie de Jong, and Kenny Tete among others.
An experienced coach with such deep ties with the club would be a valuable addition to the club. Everton's great showings off late have come off of a foundation laid by Koeman while his absence is clearly felt at Southampton as they're struggling to get away from a relegation battle.
A calm, tactically sound manager who would get everyone at the club excited is the kind of shot in the arm needed to forget the boring football the fans in Camp Nou have to endure under Valverde.