Kafwain, the third place finisher in the Santa Anita Derby, was declared from the Kentucky Derby on Tuesday after he pulled up with an apparent injury following a five-furlong workout with stablemate Indian Express.
The preliminary diagnosis is that Kafwain has suffered an injury to the check ligament of his right foreleg, according to Richard Mulhall, the racing manager of The Thoroughbred Corp.
"It just happened today," Mulhall said. "He had been perfect. It looks like there is a little filling there."
Kafwain worked five furlongs in 59.60 seconds.