Godolphin have supplemented Farhh to take on the world's best horse in the Qipco Sussex Stakes at Glorious Goodwood in England on Wednesday.
Top-rated Frankel will face a maximum of seven rivals when he puts his unbeaten record on the line.
The four-year-old Farhh steps down in distance after two fine efforts in Group 1 races over a mile and a quarter, including when going down by a half a length to Nathaniel in the Coral-Eclipse at Sandown Park this month.
He had previously stayed on strongly to take third in the Prince Of Wales's Stakes at Royal Ascot last month but is dropping back to a mile, a distance over which he won the Thirsk Hunt Cup in Scotland by six lengths earlier this season.
Saeed bin Suroor, the trainer, said: "Farhh has been doing well since he ran at Sandown and I have been happy with him.
"I think that a mile at Goodwood will suit him well but we would prefer to see some rain before Wednesday because he prefers to have a little cut in the ground.
"He has run very well in two Group 1 races but taking on Frankel will be a very tough task. I am hopeful that he can put in another good performance."
Sir Henry Cecil's Frankel recorded his 11th win from as many starts with an awesome performance in the Queen Anne Stakes at Royal Ascot and it is hardly surprising that potential opposition is thin on the ground.
For what could potentially be the four year old's final start over a mile, with next month's 10-furlong Juddmonte International at York on his agenda, he is once again set to be joined by his three-parts brother and regular pacemaker Bullet Train.
Richard Hannon has entered Strong Suit, who was a long way behind Frankel at Royal Ascot and connections have suggested he is more likely to stick at sprint distances for the moment after running in the July Cup. Aidan O'Brien could be represented by the Irish 2,000 Guineas winner Power, the Jersey Stakes heroine Ishvana and Reply. Gabrial from the Richard Fahey stable completes the confirmations.
Godolphin have been successful in the Sussex Stakes with Aljabr (1999), Noverre (2001) and Ramonti (2007).
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