Aidan O'Brien confirms Luxembourg will miss Derby due to 'muscular injury'

Aidan O'Brien was speaking at Leopardstown on Sunday and revealed Luxembourg would not take part at Epsom.

The horse - which won the Futurity Trophy at Doncaster last season - is believed to be out of action for up to six weeks.

Speaking at Leopardstown on Sunday, O'Brien said: "Luxembourg won't run in the Derby. He has to have a month or six weeks of box rest.

"Hopefully he'll be back for the autumn, that's the plan anyway.

O'Brien still has the Derby favourite Stone Age who won at Leopardstown just before Luxembourg was confirmed to be missing the event.

The further Stone Age went the better he looked and the winning margin of five and a half lengths emphasises his superiority.

O'Brien - who won the race for the 15th time - was delighted with the performance.

⏰ A pivotal 10 minutes in the Derby picture?

With Luxembourg ruled out of the race, Stone Age outlines his credentials for the Epsom Classic with a brilliant win in the Derby Trial for Aidan O'Brien & Ryan Moore @LeopardstownRC | @Ballydoyle pic.twitter.com/8KKaNuJxoK

"He came forward lovely and we thought he'd come forward a bit more from today. The plan was to give him two runs and because he was a maiden he started in Navan and then came here.

"He ran over seven furlongs in a Group One - he's a high tempo horse."

He added: "We didn't think it (Epsom) would be a problem. His two runs this year were left-handed. He usually steps quick out of the gate, he's a high cruiser and he's very happy to get a lead, which he was going to do today if someone was going to take him.

"He's a big hardy horse, he's not a wimp now."

"Because all the races were at different times they were all on different work schedules.

"You'd have to be very happy, any of the ones