O'Brien quartet set for the Derby Aidan O'Brien is set to have four runners in Saturday's Dubai Duty Free Irish Derby at the Curragh. The Ballydoyle handler currently has nearly 30 horses engaged in the Group One event but his Epsom second and third, US Army Ranger and Idaho, are set to spearhead his team with Investec Derby also-rans Shogun and Port Douglas in the mix. Deauville also took his chance at Epsom but after finishing 11th, O'Brien is now looking towards the Coral-Eclipse with him. He said: "The horses have come out of Epsom well. We are looking at US Army Ranger and Idaho and probably Shogun and Port Douglas. "Deauville will not run. We felt in the Dante at York that in the last half-furlong he didn't quite get home and it looked like he didn't stay at Epsom, so at this stage we are looking at bringing him back to 10 furlongs for the Eclipse." Paul Hensey, manager of the Curragh, is expecting a mixed bag on the weather front for the next few days but is anticipating an improvement in conditions ahead of the weekend. He said: "We had 14.6 millimetres of rain yesterday, it was persistent rain all day. The ground is currently yielding on the straight course and good to yielding on the round course. "The forecast is a bit mixed up until Thursday, but it should pick up after that and temperatures are due to rise."