WC player no doubt and a good signing as long as he's rotating with Carrick. If both start then its not a good signing as Herrera will most likely be dropped and it would make a even worse signing because Pereira will hardly get any minutes at all.
I can see Carrick being moved on next season (don't want it to happen as I think he's the deep lying midfield in the PL and a WC player) and Bastian taking his position in the team. Rooney and Bastian as the 2 senior players in the squad doesn't sound to bad as long as we keep bringing in/develop players that will be here for the long term Like Herrera, Darmian, Blind, Rojo, Shaw, Depay, Januzaj, Pereira, Wilson.