Katie Walsh appears to be a doubt for Saturday's Grand National after suffering a serious arm injury at Aintree on Thursday.

Walsh was taken to hospital following a fall from Distime at The Chair in the Foxhunter's, which is run over National fences.

She was due to ride the Paul Nicholls challenger Wonderful Charm in the big race on Saturday. 

Katie Walsh has a serious arm injury after a fall at The Chair - her #GrandNational ride on Wonderful Charm is in doubt. Get well, Katie pic.twitter.com/NrXaTgOUUZ

— ITV Racing (@itvracing) April 6, 2017

Nick Scholfield is expected to replace Walsh if she is unable to take part in the Grant National.