Aidan O'Brien will attempt to add yet another Classic to his impressive 2012 haul in the Darley Irish Oaks at the Curragh on Sunday afternoon.

The Irish 1,000 Guineas is the only Classic in Britain and Ireland not to have gone the way of the genius from Ballydoyle this season and Epsom heroine Was will lead a team of three for him at the Curragh.

Was, a 20-1 shot when she landed the Oaks by a neck from Shirocco Star, who reopposes again today, will be attempting to become the 14th filly to complete the Epsom-Curragh Oaks double, a feat O'Brien achieved with Alexandrova in 2006.

O'Brien, who is also represented by Twirl and Devotion in the seven-strong field does have concerns about the ground at the Curragh for Was.

He said:"We've been very happy with Was since her Oaks win. She came on well from her Naas run and, hopefully, she will have come forward again since Epsom.

"However, the ground is a bit of a worry. It was very nice ground at Epsom and testing conditions won't be ideal for her. We had planned to run her in the Pretty Polly Stakes three weeks ago but we took her out because of the very testing ground as we didn't want to run her on it before going for the Irish Oaks."

Twirl, will race is a visor for the first time, and O'Brien added: "Twirl was very lazy at Ascot when she ran fifth in the Ribblesdale and visors might help her concentrate a bit more. She might handle the ground."

Great Heavens edges it at the head of the betting at 7-4 from 2-1 chance Princess Highway with Was available at around the 3-1 mark.