A quality entry of 35 horses has been received for the £100,000 mile and a half contest, which is one of three opening-day Pattern races alongside the Group 2 Arqana July Stakes and the Group 3 Bahrain Trophy.
Frontiersman landed a smooth success in a valuable handicap on the Rowley Mile in May, before chasing home Highland Reel in the Coronation Cup at Epsom.
He is set to take his chance ahead of Appleby’s two other entries, Hawkbill and Scottish.
"Frontiersman is set to be my runner in the Princess Of Wales’s Arqana Racing Club Stakes," confirmed Appleby.
"He came out of the Coronation Cup well and we intended to run him in the Hardwicke Stakes, only for him to scope dirty and there was then not quite enough time to get him ready for Ascot.
"But he did a nice piece of work last Saturday and, provided he maintains a clean bill of health, it’s all systems go for the Princess Of Wales. A repeat of his Coronation Cup run should put him bang in contention."
A number of other trainers have multiple options for this showpiece event, not least Sir Michael Stoute and John Gosden, who are both responsible for five entries.
The Stoute quintet is led by Her Majesty The Queen’s Group 2 Yorkshire Cup hero, Dartmouth, while the Gosden team is headed by the five-time Group race winner, Western Hymn.
Aidan O’Brien has three engaged including Idaho, triumphant in the Group 2 Hardwicke Stakes at Royal Ascot last month, while Roger Varian has four, most notably Hardwicke runner-up Barsanti.
The Princess Of Wales’s Arqana Racing Club Stakes is one of the first times in the year that the top three-year-olds get the chance to take on their elders and the dual Group 2 scorer Permian is among four entries from the Classic generation.
