Pletcher pointed to the Preakness, the Peter Pan at Belmont on May 11 or the Marine Stakes at Woodbine on May 26 as possible next races for Winning Cause.

WSJ: Orb dazzles in final pre-Kentucky Derby workout

In the aftermath of Barbaro, who was euthanized in January 2007, eight months after breaking down in the Preakness, and with the advent of social media, racing fans have come to expect regular, detailed updates about injured racehorses.

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Other possibles include Derby runner-up Golden Soul, Mylute (fifth in the Derby, third in the Preakness), Freedom Child, Power Broker and Code West.

WSJ: Belmont Stakes: Oxbow vs. Orb in the cards