The Aidan O'Brien-trained Australia is one of 17 horses in contention for Saturday's Derby at Epsom after the latest declaration stage.

A son of 2001 Derby winner Galileo out of 2004 Oaks winner Ouija Board, Australia is the favourite to follow in the hoofprints of his parents following his excellent effort to finish third in the 2000 Guineas at Newmarket.

O'Brien, who makes no secret of the regard in which he holds the exciting three-year-old, has saddled four previous Derby winners in Galileo, High Chaparral (2002), Camelot (2012) and Ruler Of The World (2013).

He is also set to run Geoffrey Chaucer, an unlucky third in the Irish Derby Trial, Chester Vase winner Orchestra and Dee Stakes scorer Kingfisher.

The John Gosden-trained Romsdal is a late entry and joins stablemate Western Hymn, winner of the Sandown Classic Trial.

The O'Brien quartet form part of a formidable Irish challenge, with Dermot Weld's Fascinating Rock and the John Oxx-trained Ebanoran in line for a rematch after finishing first and second in Irish Derby Trial.

Ebanoran passed the post first, but was relegated to second by the stewards following interference in the closing stages.

Godolphin have three contenders in Pinzolo, Sudden Wonder and True Story.