According to Marca, Casey could perfectly succeed Busquets, and the Milan midfielder would love to join Barca.

Casey's contract with Milan expires this summer, and according to previous sources, he has decided not to renew his contract with Milan, and Barca are interested in waiving the player.
Marca said Casey could take over Busquets perfectly, and although Liverpool and Paris are also watching him, the players themselves are keen to join Barca.