Liam Treadwell and Daryl Jacob will both have to pass the doctor before riding in the Randox Health Grand National after suffering heavy falls in the Topham Chase at Aintree on Friday.

Treadwell, who won the 2009 National aboard 100-1 shot Mon Mome, is due to partner Tenor Nivernais for trainer Venetia Williams in the Aintree spectacular on Saturday, but only made it as far as the first fence before falling from the Williams-trained Bright New Dawn in the Topham Chase.

The field had to bypass the obstacle second time around as Treadwell was being attended to by medics.

Williams said: "Liam was a bit winded and a bit sore but as far as I know, he's basically OK."

Jacob, also a National hero having struck gold on Neptune Collonges in 2012, was partnering Ballykan for his retaining owners Simon Munir and Isaac Souede when he came to grief at the third fence.

He is due to carry the same colours aboard the well-fancied Ucello Conti for Irish trainer Gordon Elliott in the world's most famous steeplechase.

Jacob said: "I'm fine - 100 per cent.

"I'll have to pass the doctor, but that won't be a problem."

Jacob is also set to ride Messire Des Obeaux for Alan King in the Betway Mersey Novices' Hurdle.