I'll Have Another will have one more rival in the Belmont Stakes as he tries to become the first Triple Crown winner in 34 years.
The owners of My Adonis said Tuesday that their colt would run in Saturday's 1 1/2-mile race, bringing the prospective field to 12. Ramon Dominguez is expected to ride.
George and Lori Hall won last year's race with 24-1 long shot Ruler On Ice.
My Adonis was third in his most recent start, the Canonero II Stakes at Pimlico on May 19, the same day I'll Have Another won the Preakness. My Adonis, trained by Kelly Breen, is expected to be entered when post positions are drawn on Wednesday.
The Halls will be trying to become the first owners to register back-to-back wins in the Belmont since Riva Ridge and Secretariat won in 1972 and 1973 for Meadow Stable.