Barry Geraghty was taken to hospital for further checks following a fall in the BetBright Genius Adonis Juvenile Hurdle at Kempton.
His mount, the 8-15 favourite Charli Parcs, came to grief at the penultimate hurdle in the Grade Two event, with Geraghty appearing to take a kick to the upper body from a following horse.
While Geraghty eventually rose to his feet and walked gingerly into the ambulance, clerk of the course Barney Clifford confirmed the rider had headed to St George's Hospital in nearby Tooting for a more thorough check.
@AP_McCoy and JP McManus taking care of Barry Geraghty as he goes to hospital to get checked over after fall with #CharliParcs @itvracing pic.twitter.com/9fELRmO0TT— Matt Wilson (@onthetee76) February 25, 2017
Clifford said: "I've spoken to Barry and he's going to hospital for further examination at St George's in Tooting."