Diagnosis and prescription for Paul Pogba's struggles

Manchester United's no-good, very bad week has raised a number of questions about the club's future. Losing to Manchester City, Feyenoord and Watford in the space of eight days will do that to a team. Some of those questions, like ones about Wayne Rooney's place in the side, are short-term. Some, like questions about whether Jose Mourinho is still an all-time great manager are more medium-term. But no question looms over the future of United like the ones surrounding Paul Pogba.