England reached World Cup semis yet midfielder did not play a minute. But he is key to Manchester United in derby

It was a sight the England press pack became increasingly used to seeing after the team’s World Cup matches over the summer. Kobbie Mainoo was invariably the first to leave the dressing room, walk through the mixed zone – eyes dead ahead, features impassive – and board the bus.

It was as if he could not get out of the stadiums quick enough and the further England progressed the more pronounced it started to feel. There was a real gap between Mainoo and the next England player to depart the stadium in the knockout rounds. The Manchester United midfielder is inscrutable, even in the heat of battle. It is part of his enviably unflappable temperament. It was no great leap to imagine what lay behind the mask – tremendous frustration as Thomas Tuchel kept on leaving him out.