Palmer said: “The horse is in great nick but we always knew after his niggle at the beginning of March that the Derby would be cutting it fine.
Best Of Days (blue) will head to Royal AscotGetty Images
“His work (on Friday morning) was particularly satisfactory but he just got tired.
“And if a horse is getting tired over a mile-and-a-quarter gallop eight days before the Derby they are not going to run to the best of their ability.
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“He has grown a lot over the winter and is much bigger and stronger, and with him being a big horse it takes a little bit more time to get him ready.
“The Derby is the world’s greatest race but it takes a hell of a horse to win it, so rather than push him and let him run poorly we will look at other options.
"He is in the King Edward VII, the Queen's Vase, the Irish Derby and the Eclipse.
"We have got a month to Ascot and that takes the pressure off.
Palmer is taking his time with Best Of DaysPA
"I think at this stage, although he has an entry in the Queen's Vase, I would say the King Edward VII is more likely.
"He is a gorgeous horse and I can't wait to run him."
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