Belmont Stakes winner Summer Bird has been ruled out of next weekend's Japan Cup Dirt after a small chip was detected in his right front carpal bone.

According to the colt's owner, Dr. Kalarikkal Jayaraman, the chip was detected following the 3-year-old colt's trackwork at the race's venue Hanshin Race Course on Sunday morning.

"He breezed today in preparation for the race and afterward he was not walking right, so (trainer) Tim (Ice) took an X-ray and they found the chip," Jayaraman said from Japan. "We are going to watch him for a couple of days here and then ship him back to Lexington. He's comfortable, he's not in any pain."