Investec Derby meeting, Epsom 4-5 June
Coverage: BBC TV, 5 live and BBC Sport website
Holland will miss the Derby and could be out of Royal Ascot
Michael Hills has been recruited to replace the injured Darryll Holland on Chester Vase winner Ted Spread in the Derby at Epsom.
Holland misses the Epsom Classic after breaking his collarbone at Beverley.
Ted Spread's trainer Mark Tompkins had indicated he would like six-time champion jockey Kieren Fallon to take the spare ride on 5 June.
"He may still be hanging out for one of Aidan's (O'Brien), I don't know, but I couldn't hang about," said Tompkins.
Ted Spread is rated around a 33-1 chance for the world's most famous Flat race.
O'Brien has four Derby leading contenders in St Nicholas Abbey, Jan Vermeer, Cape Blanco and Midas Touch.
Johnny Murtagh will have the pick of these, but Fallon could potentially ride one of the horses he rejects.
Newmarket trainer Tompkins added: "Michael has ridden quite a lot of winners for me over the years, including a Duke of York and a Middleton Stakes. We go back a long way Michael and I.
"He's got the experience, he's ridden a Derby winner, and you need someone with experience of Epsom. That was why he was my choice and the owners are quite happy so we have gone for him."
Holland tumbled as Misty Morn left the stalls in the Hilary Needler Trophy and was taken to hospital for X-rays.
He could also miss the Royal Ascot meeting, which is held from 15 to 20 June.
Holland's agent David Harrison said: "He'll be out for three to four weeks at least. It's not just missing the Derby, it's such a busy time of year."
Tompkins believes his charge will put up a good show in the premier Classic.
"We went to Chester for the ground, and once he won that we thought we had to have a go at the Derby," he added.
"I hope he won't disgrace himself, I think he could be fourth or fifth."