Kieren Fallon has admitted defeat in getting a ride in the Ladbrokes St Leger this weekend.
The former champion jockey has been booked to ride Swop for Luca Cumani in another race at Doncaster on Saturday, but is without a mount in the final British Classic of the season.
Almost all the probable runners have riders pencilled in and although Aidan O'Brien and John Oxx have not completely finalised their plans, they are unlikely to involve Fallon, who has been in electric form in the few days since his drugs ban elapsed.
"I'll be here on Saturday but I'm not riding in the Leger," said Fallon.
Johnny Murtagh is set to ride O'Brien's Age Of Aquarius, which has prompted the sponsors to harden the favourite further into 9-4 from 5-2.
David Williams of Ladbrokes said: "Confirmation of Murtagh's riding plans was always going to have a bearing on this market.
"Age of Aquarius is now easily the best backed horse in the race and looks sure to go off a very popular favourite come Saturday afternoon."
Kite Wood remains an uneasy 3-1 second favourite with the same firm.
O'Brien has several other horses to act as pacemakers for Age Of Aquarius and Changingoftheguard and although Kite Wood likes to lead too, his jockey Frankie Dettori is not bothered about facing competition.
The former Michael Jarvis-trained colt has won his last two starts at Newmarket and Newbury and the Italian's more pressing concern is that the ground does not quicken up too much.
"When he won at Newbury it was very firm," said Dettori.
"He's a big horse and he hits the ground very hard with his shoulders.
"As long as Doncaster produce safe, good ground, we'll be very happy. The last thing we want is (to be) running a big horse like that on very firm ground as I would say he will not be as effective.
"If Doncaster produces good ground everybody will be happy.
"I dropped him in in the Dante but then I made the running on him when he won, he just needs a nice even pace. I'd be delighted if (Aidan) O'Brien has some pacemakers because being in front for a mile and six furlongs can be a very lonely place.
"I think if they run pacemakers it will suit us, Ballydoyle and everybody, I'll be very pleased to drop him in," he told At The Races.