Britain's retired champion is expected to remain at Hollywood Park for another three to four weeks while he recovers from the injury that ended his racing career on Thursday.
The colt has responded well to the operation to insert two screws in the cannon-bone fractured during his final piece of exercise for the Breeders' Cup.
Stuart Messenger, Kevin Bradshaw and Mick Blair, Michael Stoute's backroom team, have kept a round the clock watch on the horse.
Sheikh Mohammed's racing manager Anthony Stroud said: "I went to see Singspiel on Saturday after the racing and he seemed in very good order."Reuse content