|Cheltenham Festival 2015|
|Dates: Tuesday 10 to Friday 13 March. Big races: Tue - Champion Hurdle, Wed - Champion Chase, Thur - World Hurdle, Fri - Gold Cup.Coverage: Every race on BBC Radio 5 live or 5 Live Sports extra|
The 2013 winner Cue Card has been ruled out of the Ryanair Chase at the Cheltenham Festival on 12 March.
Trainer Colin Tizzard said the nine-year-old suffered a late setback which will rule him out for the second year running.
"He'll miss Cheltenham but he should be OK for Aintree [in April]," said the Somerset trainer.
Don Cossack, trained in Ireland by Gordon Elliott, is the 3-1 favourite to win the two mile, five furlong contest.