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A crash excluded Harry Cobden from the Randox Grand National after suffering a crash earlier on the Aintree map.
The lead runner came out of Lucky One in the second race of the day, Rank 1 Betway Mersey Novices’ Hurdle.
Cobden, 22, a stable jockey at 11 times champion coach Paul Nicholls, was taken to hospital for evaluation.
It was reported that he was knocked unconscious when he hit the ground, but regained consciousness and was able to walk to the ambulance.
An update from the British Horseracing Authority on Twitter read: “Following a fall in Race 2, Harry Cobden was removed from his post by medics and will not be resuming his races for the remainder of the day. driver changes will follow in due course. ”
Cobden was to team up with Give Me A Copper at the National, a horse owned in part by Sir Alex Ferguson.
ITV Racing reported that Sean Bowen will now tour the 11-year-old, around 40-1 with the bookies.
The favorites won the first three races – Hometown Boy (6-1f), My Drogo (5-4f) and Shishkin (1-8f).
The latter, unusually short in betting, failed to impress when chasing Grade 1 novices Doom Bar Maghull.
Jockey Nico de Boinville said he was “idling” towards the final fence and suggested he had better canter harder.