Manchester United’s hopes of selling Anthony Martial to Marseille have just suffered another blow as Marseille seemingly shut the door to the Premier League frontman. It turns out that finding a buyer for an injury-prone, incredibly well-paid striker – one who is due to become a free-agent only a few months down the line – is easier said than done. Funny, that. Anthony Martial is reportedly set to see out the remainder of his £250,000-a-week Manchester United contract, before bringing a long overdue end to nearly a decade-long stay at Old Trafford in July rather than in January. Links with clu…