Manchester United players in the BT Sport studio, following the 1-0 win over FC Copenhagen, summed up the situation succinctly. Robin Van Persie, asked about Martial and how far he has come under Ole Gunnar Solskjaer, turned to Paul Scholes and remarked innocently: "He was struggling under Mourinho right?" Scholes' reply was typically deadpan: "Who wasn't?" The transformation of Martial under Solskjaer is simply incredible.