Pacha Du Polder will be put away for the campaign but will return in 2019 in a bid to win the Foxhunter Chase at Cheltenham for a third successive year.
The 11-year-old provided one of the stories of the Festival, when storming up the hill to give 22-year-old Harriet Tucker a remarkable triumph on what was only her second ride under rules.
"It was great for Harriet on what was just her second ride and for her to put her shoulder back in after dislocating it was amazing," said owner Andy Stewart.
"He's not going to Aintree for the Fox Hunters' there. That race over two miles five is too short for him."
He added: "He will be roughed off now and put away for the season.
"He'll come back and have a prep race at either Stratford or Doncaster and then go back to Cheltenham to try and win a third Foxhunters.
"All being well, Harriet will have the ride again unless she can do what Bryony (Frost) did after winning him on last year. She turned professional and has ridden loads of winners in such a short space of time!"
One of Stewart's Cheltenham runners that is set for Aintree next month is Saphir Du Rheu, who is bound for the Betfred Bowl.
The Paul Nicholls-trained grey was pulled up at the fourth-last fence in the Gold Cup won by Native River following an epic duel with Might Bite.
"He's fine. Sam Twiston-Davies pulled him up as he just hated the ground. After that, Paul Nicholls asked me if I still wanted to run Pacha in the Foxhunters on that ground and I said 'yes,I do'," said Stewart.
"Saphir will now go to Aintree. I don't think the big two (from the Gold Cup) will be going. He certainly deserves his place in that race."
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