Anthony Martial was the hero for Manchester United in Saturday’s 1-0 win over Tottenham but club great Gary Neville has accused the 21-year old of only ever playing at “85 per cent” of his ability. Martial enjoyed an explosive first season for United in 2015-16 after signing from Monaco but struggled to convince manager Jose Mourinho to give him a regular starting spot last term. The forward has enjoyed an encouraging start to the campaign, scoring six times and registering six assists in 14 appearances in all competitions, seven of which have been as a substitute. Neville thinks Martial has the talent to be “tearing this league apart” but thinks Mourinho and France head coach Didier Deschamps have identified a problem in his attitude. “It’s been a stop-start Manchester United career for Martial,” he told The Gary Neville Podcast. “For someone of his talent, he should be tearing this league apart with his ability. He’s lost his place in the France squad….