Arkle favourite Simonsig will miss his intended Cheltenham prep race after being ruled out of the Betfair Super Saturday Chase at Newbury.
Nicky Henderson's exciting grey was set to be a heavy odds-on favourite for Saturday's race but won't now run following an unsatisfactory scope.
Henderson told racingpost.com: on Thursday evening: "Simonsig's trachea wash result today was 95 per cent but we'd only run if it was 100 per cent.
"Accordingly, we'll give him a week ticking over at home and then make a decision over whether to run before the festival."
Simonsig was a brilliant winner of his two chases to date - at Ascot and Kempton and looks set to be one of the warmest favourite's at next month's four-day showpiece.