The Storyteller was the one withdrawal as the ultimate discipline of 40 horses – headed by Cloth Cap – was named for the Grand National on Saturday.
It means Blaklion is the final horse to be assured a run within the huge race at Aintree.
Some Neck and Welsh Grand National winner Secret Reprieve are the highest reserves.
Patrick Mullins will experience main contender Burrows Saint for his coach father Willie Mullins.
Stable jockey Paul Townend will miss the experience after struggling a foot harm.
A reserve could make the line-up if any contenders are pulled out earlier than 13:00 BST on Friday.
Cloth Cap, educated by Jonjo O’Neill, is the 4-1 favorite to present proprietor Trevor Hemmings a file fourth win in his inexperienced, yellow and white colors.
Mullins is one among 4 novice jockeys to be booked for rides within the race – with Jamie Codd on Milan Native, Derek O’Connor driving OK Corral and Sam Waley-Cohen aboard Jett.
They might be bidding to be the primary novice rider to triumph since Marcus Armytage in 1990 and are permitted to experience after the most recent easing of lockdown restrictions, having been barred from competing finally month’s Cheltenham Festival.
One contender who seems certain to be well-liked is Minella Times, the mount of Rachael Blackmore – who made historical past at Cheltenham by changing into the primary lady to be main jockey on the assembly.
Bryony Frost is on Yala Enki and Tabitha Worsley rides Sub Lieutenant within the hunt to be the primary feminine jockey to win the Grand National.
Last yr’s Grand National was known as off due to the Covid-19 pandemic, whereas this yr’s contest might be held with out spectators.
Police are stepping up patrols across the assembly, with residents near the Merseyside observe warned to not collect in teams bigger than six of their gardens throughout the races.
Tiger Roll returns to Aintree – however not the National
Two-time Grand National winner Tiger Roll will return to the scene of his greatest triumphs on Thursday – however in a special race at Aintree.
The 11-year-old runs in the Betway Bowl, the place rivals will embody Clan Des Obeaux and Native River.
It is the characteristic race on day one of many fixture, which culminates with Saturday’s National.
Tiger Roll was withdrawn final month from the National, which he received in 2018 and 2019.
Owners Michael and Eddie O’Leary mentioned they have been unhappy with the weight the horse had been allotted.
Tiger Roll grew to become the primary horse since Red Rum within the 1970s to win consecutive runnings of the Grand National when triumphing in 2019.
Currently educated by Denise Foster whereas Gordon Elliott serves a suspension, he recorded a fifth Cheltenham Festival victory in March.
Thursday’s race is a three-mile contest with stage weights, in comparison with the four-and-a-quarter miles of the National, which is a handicap the place the 40 runners carry totally different weights.
Clan Des Obeaux is a two-time King George VI Chase winner and Native River received the Cheltenham Gold Cup in 2018.
Rivals embody this season’s King George runner-up Waiting Patiently, together with Aso, Mister Fisher, Clondaw Castle, Real Steel and 100-1 outsider Militarian.
Former champion hurdler Buveur D’Air, educated by Nicky Henderson, runs within the Aintree Hurdle after lacking final month’s Cheltenham Festival.
Billaway, Cat Tiger and Dashing Perk are among the many runners within the assembly’s first race over the National fences as novice jockeys sort out the Foxhunters Chase.
The race is being run within the identify of former Aintree chairman Rose Paterson, who took her personal life final yr.
On Saturday her husband, North Shropshire MP Owen Paterson, is launching the Rose Paterson Trust, a charity supporting suicide prevention tasks.