The Lockinge Stakes remains the likely starting off point for Frankel after took to the gallops for the first time on Wednesday.
Frankel has never been beaten in nine starts and his Classic year proved hugely successful as he dominated the mile division with stunning runs in Queen Elizabeth II Stakes and Sussex Stakes.
He was given a lengthy break to recover from his heroics but he looked sharp when he returned to the gallops on the Al Bahathri at Newmarket on Wednesday.
Connectins plan to step the son of Galileo up to a mile and a quarter during the season but the Lockinge Stakes at Newbury on May 19 is the first port of call for Prince Khalid Abdullah wonder horse.
"It was only a very gentle piece of work, but he looks well and seems in good form," said Grimthorpe.
"It is always encouraging to see the horses back on the gallops, but really they were not doing enough to tell you a lot about where they are.
"I've obviously seen Frankel a few times over the winter and he looks to have done well and strengthened up a bit.
"We're still aiming towards the Lockinge at Newbury."