There are two versions of Michael Carrick the coach: the interim manager who took charge of Manchester United for three games and the Middlesbrough manager who spent three years in the Championship. The nature of both projects could not have been more different, with one an extremely short-term job and the other a long-term assignment. Five months, as interim head coach until the end of the season, lands awkwardly in the middle, so how might Carrick set United up? BBC Sport looks at the