Leighton Aspell has been taken to hospital for further checks following a nasty fall at Fontwell on Sunday.
Partnering Uptendownone in the Stephanie Rees Rainbow Child Foundation Handicap Hurdle, Aspell parted company with his Gary Moore-trained mount at the second obstacle.
The dual Grand National-winning jockey was initially treated on the track before being taken to hospital in Brighton for further examination.
The track tweeted: "Leighton Aspell is conscious and on his way to Brighton Hospital. We wish him all the best."
Clerk of the course Edward Arkell added: "He was taken directly to hospital in Brighton and he was concious when he left the racecourse."