Simon Francis v Anthony Martial
Stand-in skipper Francis is a right-back by trade but was Man of the Match as a central defender at Stamford Bridge. Martial should be spared the blame for United's Champions League exit. He starred and impressed, and is looking back at his best. Francis must worry about what he could do in the inside-left channel.
Harry Arter v Michael Carrick
Van Gaal erred by leaving his vice-captain on the bench for 69 minutes in Germany. Others' absences should ensure Carrick returns. Arter cost Bournemouth £4,000 from non-league Woking and has become an Ireland international. An excellent technician, he is the most attacking of their three central midfield players.
Joshua King v Daley Blind
King began his career at United, though he never started a game for them. The Norwegian is an infrequent scorer but seriously quick, which could cause the slow Blind problems. Yet the Dutchman is pivotal; he may be the only senior, specialist defender and could have the task of holding a new-look back four together.