NEW YORK (AP) — Kentucky Derby and Preakness winner I'll Have Another is out of tomorrow's Belmont Stakes because of an injury. And his trainer says he probably won't race again.

The colt was heavily favored to become horse racing's first Triple Crown winner since 1978.

According to the brother of trainer Doug O'Neill, I'll Have Another went out for a gallop this morning, and afterward the tendon seemed "kind of tender."

The trainer told "The Dan Patrick Show," ''It's not tragic, but it's a huge disappointment." When asked if I'll Have Another has run his last race, O'Neill said, "If I had to wager, I would say yes."

Eleven horses are still set to go to the starting gate tomorrow for the mile-and-a-half race.

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GRAPHICSBANK: "I'll Have Another", ridden by exercise rider Jonny Garcia during training for Belmont Stakes, Belmont Park, Elmont, New York, over muted logo, partial graphic (8 Jun 2012)

APPHOTO NY153: FILE - This June 7, 2012 file photo shows I'll Have Another being tended to after a bath at Belmont Park in Elmont, N.Y. I'll Have Another's bid for a Triple Crown ended with the shocking news that the colt was out of the Belmont Stakes due to a swollen left front tendon. According to Dennis O'Neill, brother of trainer Doug O'Neill, the horse galloped Friday morning, June 8, 2012, and after a veterinary scan, the tendon seemed "kind of tender." (AP Photo/Mike Groll, File) (6 Jun 2012)

<<APPHOTO NY153 (06/06/12)>>

APPHOTO NYML110: I'll Have Another walks in the barn after a morning workout at Belmont Park, Friday, June 8, 2012 in Elmont, N.Y. The Triple Crown hopeful runs Saturday in the Belmont Stakes. (AP Photo/Mark Lennihan) (8 Jun 2012)

<<APPHOTO NYML110 (06/08/12)>>