By Racinguk.com staff
Fox was riding Justantenner for Barry Murtagh in the first division of the Double Five Whitburn Handicap Hurdle, when falling at the third flight.
Clerk of the course Anthea Morshead, said: "He's going to Borders General for a check-up. He was briefly knocked unconscious, but by the time he went to hospital he was talking."
He went on: "Obviously it is in everyone's interests for him to go and get checked out."
Fox partnered the Lucinda Russell-trained One For Arthur to glory at Aintree in April and the eight-year-old was favourite to repeat the feat next year, before being ruled for the season with a tendon injury on Friday.