Before starting, this concept squad is considering that Leao leaves if not then the strikers would be Rafa-Zirkzee with rafa being wide in the left and with some more freedom as now as Matias Suarez used to do at River.
Not long ago it was said that Moncada liked Gallardo’s profile and he is my favorite choice for Pioli’s replacement.
A very flexible manager that switches his formation according to the rival and to the players that he has although the idea is the same, using the possession of the ball to hurt the rival with the help of different movements to create space from the midfield and strikers, the fullbacks become wingbacks in possession and midfielders have freedom to move all around so they can have space to receive or they can build space for someone else to receive.
Defensively Gallardo’s teams tend to use a high and organized press being the strikers the first defenders. Also another possibility is moving the rival to the lines to activate the high press. In possession the team works as a 3-3-2-2 so they can defend any counter attack situation.
Apart from being a genius tactically Gallardo is a great team manager as at River he built a “family” having always, through his 8 years at the club, a unit group also despite being taken every transfer window key players.
He also uses a lot the young players as he believes that a player must trains as same intensity as when he plays so if you work well you will play and eventually get better because he is always keen on improving players and getting the best from them.
There is a lot to say about Marcelo Gallardo but I think it is enough by now so if you have any suggestion for the squad feel free to say and also feel free to ask any question that you have!

Other players to consider:
Colpani/similar to Nacho Fernandez
Bourigeaud
Medina
Danso
Hojbjerg
Dedic
Ouedraogo
Palacios
Beltran
Schick