Chester Vase winner Doctor Fremantle has been cut by a number of bookmakers for the Vodafone Derby at Epsom on June 7.
Sir Michael Stoute's son of Sadler's Wells is expected to be added to the field at the supplementary stage five days before the big race at a cost of £75,000.
If Doctor Fremantle is handed the chance to run, it would mean Sir Michael Stoute could be represented by three horses prominent in the ante-post lists as he also has Tartan Bearer and Tajaaweed in the melting pot.
Having seen plenty of support, Coral were forced to cut Doctor Fremantle to 10-1 from 14's and have eased Tartan Bearer one point to 5-1 with jockey bookings sure to have an effect on the market.
Although the moves seem to have added a degree of stability to what has been a topsy-turvy betting heat, punters are still in the dark as to whether Casual Conquest will be supplemented.
Dermot Weld's Derrinstown Stud Derby Trial winner heads Coral's market at 5-2 but connections are keen not to rush a decision regarding his participation.
Explaining Doctor Fremantle's position, spokesman David Stevens said: "Punters have decided that 14-1 was too big about a horse that could well be added to the Derby field.
"And if indeed Doctor Fremantle does line up at Epsom, then Ryan Moore's choice of mount is likely to have a significant impact on the Derby betting."
A total of 21 horses remain in the race following the latest forfeit stage, with Henry Cecil giving a strong indication Kandahar Run could be given his chance.
The grey was supplemented at a cost of £8,000 in April and has made steady progress in his two runs this season, most recently with a victory in the Listed Newmarket Stakes.
"I don't know yet, but if he keeps going the right way he could possibly be a horse for the Epsom Derby. I will decide over the next 10 days," said Cecil.
"I'm very happy with him. He seems very relaxed and has a good turn of foot. He may be entitled to be there."
Cecil did at one time have the ante-post favourite in the shape of Twice Over, only to see the previously unbeaten colt finish a well-beaten third in the Dante Stakes at York.
The Warren Place trainer is now targeting Royal Ascot and the St James's Palace Stakes.
Cecil said: "He didn't like the ground at York and I don't think he stayed, but his blood was wrong. He was bouncing when he left, but he came back with a wrong blood count and must have picked up an infection in transit.
"He seems OK now and I'll hopefully take him to Ascot. He won't run over a mile and a half and is more likely to go over a mile.
"Although the mile there is not as stiff as it was, I think it will suit him if the ground is good and he will be a fresh horse.
"The way he works he has come on a lot from Newmarket (Craven Stakes), he was a bit of a baby there."
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