He's one the race twice before.
Altior has been ruled out of Wednesday's Queen Mother Champion Chase at the Cheltenham Festival.
Trainer Nicky Henderson revealed that the 11-year-old returned an unsatisfactory scope after he coughed following exercise this morning .
Altior has won the race twice before as well as the Arkle and the Supreme Novices’ Hurdle.
The going on the course has been described as soft, good to soft in places following unexpected rainfall of 10 millimetres overnight.
Meanwhile, there's an eight race card at Punchestown this afternoon where the first goes to post at 13.55.
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