Blaklion will face eight rivals in Saturday's Betfred Grand National Trial Handicap Chase at Haydock.
Currently the ante-post favourite for the National itself following his easy victory in the Becher Chase, Nigel Twiston-Davies has entrusted the mount to his son Sam, with the intention of him maintaining the association at Aintree in April.
Colin Tizzard runs The Dutchman, an easy winner of the Peter Marsh Chase who will be ridden by Danny Cook this time.
Philip Hobbs will be hoping for more from Three Faces West after an interrupted season, while David Pipe steps Daklondike up in class.
Haydock regular Yala Enki is back again, with Tom George running Wild West Wind, who was going well in the Welsh National until falling.
Paul Nicholls runs Silsol, Dan Skelton is represented by Sir Mangan, and last season's Eider winner Mysteree goes for Michael Scudamore.
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