Kingston Hill, Pinzolo, Snow Sky and Century have all been supplemented for the Racing Post Trophy at Doncaster on Saturday.
The Roger Varian-trained Kingston Hill, owned by Paul Smith, has been added to the Group One feature over a mile after winning both his starts so far.
Varian told his website: "He is in great form and hasn't put a foot wrong since winning the Autumn Stakes (Group Three at Newmarket earlier this month).
"He has shown on both his starts that he handles cut in the ground and we feel that there is more to come from him.
"He has the right profile for a race such as the Racing Post Trophy."
The Godolphin-owned Pinzolo, trained by Charlie Appleby, is also unbeaten two starts with wins at Newmarket and Newbury.
Snow Sky, owned by Khalid Abullah and trained by Michael Stoute, got off the mark at the third attempt when hacking up by 11 lengths in a Salisbury maiden over a mile.
Century, trained by Aidan O'Brien, made a successful debut at the Curragh two weeks ago.
The son of Montjeu is one of four possibles from O'Brien's Ballydoyle stable along with Buonarroti, Johann Strauss and Red Rocks Point.
Toormore, who took his 100% record to three with victory in the Group One National Stakes at the Curragh, could step up to a mile.
His trainer Richard Hannon has also left in Chief Barker, who is also unbeaten in three races and took the scalp of subsequent Shadwell Fillies' Mile winner Chriselliam at Haydock last time.
Completing the list of entries are Altruistic, Dolce N Karama, Somewhat and The Grey Gatsby.