Sir Alex Ferguson says Anthony Martial's form so far for Manchester United is the perfect response to claims that his potential £58.7 million fee was 'ridiculous'.

The Frenchman arrived at Old Trafford from Monaco on transfer deadline day for an initial £36m, but United could yet be forced to pay a further £22.7m depending on various add-ons. While the total cost has been considered by many observers to be extraordinarily high for a 19-year-old, Martial has responded by scoring three goals in his first three games for the club, with a double helping United