Last and First in Gold frame
Last Instalment and First Lieutenant will both be declared for Friday's Betfred Cheltenham Gold Cup.
First Lieutenant was among the leading contenders for the Ryanair Chase on Thursday, having chased home Cue Card in the race 12 months ago, but was not among the declarations.
Doubts remain over the participation of Hennessy Gold Cup hero Last Instalment in Friday's blue riband due to the drying conditions at Prestbury Park, but O'Leary insists it is not out of the question both horses will line up, if the ground is suitable.
O'Leary said: "We have decided to run Rathlin in the Ryanair and both First Lieutenant and Last Instalment will be declared for the Gold Cup.
"No decision has been made (on whether Last Instalment) will run.
"We could run both horses if the ground is suitable, but at the moment, it looks as though the ground would favour First Lieutenant.
"We'll just have to see what happens.