Hard to know. I think one of the reasons he's been signed is because he's versatile and could play that role, as he has done for Blackburn in the past. But I think he'll be a central defender long term and would only play a holding midfield role if we had injuries in CM.
Depends really on how decent he is with the ball at his feet. One of the most underrated aspects to Hargreaves game was that he was good with the ball at his feet as well.