Istabraq's chances of winning a third successive Smurfit Champion Hurdle have been hit by an 11th-hour scare.
Aidan O'Brien's star was found to have a trickle of blood in his left nostril after he had settled in at Cheltenham this afternoon.
A statement issued from Ballydoyle tonight read: 'Istabraq arrived safely at Cheltenham today after travelling over without incident.
'After the horse had settled in the head lad noticed a trickle of blood in his left nostril.
'Aidan O'Brien will inspect Istabraq early tomorrow morning after which a decision will be made as to whether or not he takes his chance in the Champion Hurdle.'
