It's excellent for me that he's gone after Castles of all people, as he's on Mourinho's payroll.
A bit like Gundogan, I've been extraordinarily impressed with how much of an effort he's made to fit into the culture of the club.
And like Gundogan, I won't lose too much sleep if it's a bad injury that keeps him out most of the season.
Not because I won't miss him in the team, I obviously will as we all would. But because of the confidence I have that like Gundogan it's one year missed out of a possible 5+ year career with us. When players make the effort like he and Gundogan have you know they're in it for the long haul.