From Godolphin press release

Last year’s champion 2-year-old Midshipman   will miss the Triple Crown after he sustained a minor soft tissue injury to his left fore leg during routine exercise at Godolphin’s Al Quoz Stables in Dubai Feb. 28.

According to a statement from Godolphin, he will require a period of time out of training but the prognosis for a return to racing in the second half of the year is favorable.

Racing manager Simon Crisford said: “Unfortunately, Midshipman has knocked himself and inevitably this injury will rule him out of the Triple Crown races.

“It is a huge shame as he had been pleasing us enormously and was ready to make his reappearance next Thursday.

“He is scheduled to return to America in early April and hopefully he will be back on the track later in the season.

“We can't risk him right now as we need to give his injury time to settle. It is in his best interest to give him time to return to peak fitness later in the year.”

Bred by Stonerside Stable, who initially raced him, Midshipman was part of the operation sold last year to Darley Stable. Trained by Bob Baffert, the chestnut colt by Unbridled's Song   won three of four starts during his juvenile campaign, including the Breeders' Cup Juvenile (gr. I) and the Del Mar Futurity (gr. I) while earning $1,380,200.