I agree that Carrick -- and at this point surely it will be Carrick -- will want to bring in two progressive passers, one slightly more defensive and the other slightly more attacking in their instincts, but I don't want to the let remark about Mainoo go unchallenged.
In terms of dictating play out of the back, Mainoo is not our man nor will he ever be that player. He's fundamentally more a central midfielder than a defensive midfielder who dictate play, and I'll go even further and cast doubt as to whether Mainoo will ever be a defensive asset for us. That said, whether it's Casemiro now or someone else in the future, once we transition out of the back Mainoo shows all the signs of a midfielder who can, someday -- he'll be 21 any day now -- dictate play from midfield. He's not there yet, but neither were Scholes or Keane at 21, and I doubt Pirlo was either at 21. In terms of immediate needs, yes of course we need to midfielders who can progress the ball and shield the back line when called to duty, but let's not consign Mainoo quite yet as a midfielder who's uncomfortable with the ball at his feet and can't get much of anything done in midfield.