Trainer Tim Martin was airlifted out of Heritage Park, near Picton, on Monday after a horse flipped over on him.
Martin, who has Heavens Above in Saturday's Epsom Handicap, has a suspected broken tailbone and is in Liverpool Hospital.
"I was breaking one [in] and it rolled over on me," Martin said. "It is the quickest one, [he] has never done that and with the big saddle [on] there is no ejector seat."
Two ambulances attended the Oakdale property but the decision was made to call a helicopter to get Martin out of his training centre at around lunchtime on Monday.
The resurgent horseman has been re-establishing his career, and his stable has won a couple of black type races this spring.
Heavens Above won the Sheraco Stakes, while Moral Victory is unbeaten this preparation in two runs, including winning the Shannon Stakes at Rosehill last Saturday.
The trainer is likely to have to watch Saturday's Epsom from home, as well as Moral Victory's next run in October's Toorak Handicap.
"She is a great chance in the race, I wasn't unhappy with her run [in the Golden Pendant] on Saturday and I think she will thrive on the back-up over a mile," Martin said.
"It is just a pity that I'm unlikely to be at the group 1s."
"This is a setback for the trainer but not for the horses. I will probably be out of action for a couple of weeks."
Heavens Above was the first horse out in the barrier draw for the Epsom and came up with gate eight and has been $16 to $15 at Ladbrokes.
Godolphin's Hauraki remains a $5 favouite after drawn gate 10 ahead of Palentino, barrier nine, which is a $6 chance.
Chris Waller will a dozen group 1 runners on Saturday, including Mackintosh (two), McCreery (four), Vanbrugh (seven) and Torgersen (five) in the Epsom.
He will have the favourite in Omei Sword in the Flight Stakes and after the draw for the Metropolitan also has the favourite there in Antonio Giuseppe, which has won its past four on end and is $4.60 top pick in betting after drawing perfectly in gate five.
It is one of the six runners for Waller in the 2400m group 1.
