GOLDEN Horn will face a maximum of 10 opponents as he bids to become the 14th colt to win the Investec Derby and King George VI & Queen Elizabeth Stakes at Ascot Racecourse in the same season.

If he is successful he will become the first colt since Galileo in 2001 to complete the feat, though he faces stern challengers from France and Italy as well as Impressive Hardwicke Stakes victor, Snow Sky.

Golden Horn, the three-year-old son of Cape Cross, trained by John Gosden for his breeder Anthony Oppenheimer, is unbeaten in five starts.

His latest victory came in the Group One Coral-Eclipse over 10 furlongs at Sandown Park on July 4, when he defeated The Grey Gatsby to earn an official BHA rating of 130 – the highest for a three-year-old since Frankel in 2011.

Golden Horn won the Investec Derby at Epsom Downs on June 6 just as impressively with Frankie Dettori on board, beating his stable companion Jack Hobbs, who has since won the Irish Derby, in the 12-furlong Classic.

Now, if successful at Ascot this Saturday, he would become only the fourth horse to complete the Epsom (Derby)/Sandown (Eclipse)/Ascot (King George) treble following Nashwan (1989), Mill Reef (1971) and Tulyar (1952).

Saturday’s renewal of the 12-furlong race will be the 65th running, with prize money standing at a new record of £1,215,000.

There was one supplementary entry on Monday, with Snow Sky (Sir Michael Stoute), impressive winner of last month’s Group Two Hardwicke Stakes at Royal Ascot, added to the line-up.

Meanwhile, Dylan Mouth will bid to become the second Italian-trained winner. Trained by Stefano Botti, the four-year-old son of 2007 King George winner Dylan Thomas has been successful on nine of his 10 starts.

He added a second Group One to his CV last time out, when capturing the 12-furlong Gran Premio Di Milano at San Siro on June 7.

The colt’s one reversal came at Ascot in the Group Two King Edward VII Stakes at the 2014 Royal meeting, when he was eighth of nine behind Eagle Top.

Botti said: “Dylan Mouth is very well. He did a very nice piece of work last week and will have a blow out again with his race jockey on board (Fabio Branca).

“The horse will leave Italy tonight (Wednesday) as it is currently very, very hot there, and should arrive at Ascot on Friday.

“The horse has matured, he is much calmer now. We are hoping for a much better performance than last year at Royal Ascot.

“He is both physically and mentally more mature. We are expecting a good run from him at Ascot on Saturday.”

There has been one Italian-trained winner of the King George VI & Queen Elizabeth Stakes (Sponsored by QIPCO), with the legendary Ribot sauntering to a five-length success in 1956.

The King George VI & Queen Elizabeth Stakes has gone to French-trained horses on 10 occasions and the one remaining entry from France is Flintshire (Andre Fabre).

Successful in the Group One Longines Hong Kong Vase in December, 2014, the five-year-old has been placed on his last three starts in Group One company, most recently chasing home dual Arc heroine Treve in Grand Prix de Saint-Cloud on June 28.

Telescope (Sir Michael Stoute) was runner-up to Taghrooda in the 2014 King George VI & Queen Elizabeth Stakes (Sponsored by QIPCO) but needs to bounce back from a below-par sixth behind Snow Sky in the Hardwicke Stakes last time out.

Other entries include The Corsican (David Simcock), fourth to Free Eagle in the Prince Of Wales’s Stakes at Royal Ascot and the only filly in the race.

Madame Chiang (David Simcock), a Group One winner over the course and distance in the QIPCO British Champions Fillies & Mares Stakes in October also runs.

Completing the possible line-up are last year’s Derby third Romsda (John Gosden) and soft ground specialist Clever Cookie (Peter Niven).