Katenko out of the Cheltenham Gold Cup and the Grand National

Katenko has been withdrawn from the Cheltenham Gold Cup and the Grand National after undergoing an emergency operation for colic on Friday.

The seven-year-old, trained by Venetia Williams, had won his last two races and was about a 20-1 chance for the Gold Cup.

But he has now been taken out of the biggest race, on 15 March, of the Cheltenham Festival.

Katenko will also miss April's Grand National at Aintree in Liverpool.