The well-backed Endless Acres is one of 34 horses in a maximum field for the Betfred Cesarewitch at Newmarket on Saturday.
"It was a very easy decision not to run him since Ascot and aim straight for this," said Fellowes.
"Ascot hit him hard. He's still a bit babyish. He's a late foal and by Champs Elysees so bred to be a late maturer and that day it was very fast ground and 30C.
"He looked like he needed a break so I said to the owners we'll turn him out in the field and aim straight at the Cesarewitch.
"He's goes very well fresh - he won first time out - so I'm not worried about the absence. I didn't need a prep run.
"His form is rock-solid and everything has gone smoothly. We now just need a bit of luck."