Altior to miss Cheltenham's Champion Chase

Former winner ruled out by trainer Nicky Henderson

Nico de Boinville celebrates on Altior after winning the 2019 renewal of the Champion Chase.

Altior has been ruled out of Wednesday's Queen Mother Champion Chase at the 11th hour for a second successive year.

Nicky Henderson's 11-year-old, who has won the race twice previously as well as the Arkle and the Supreme Novices' Hurdle, coughed after exercise on Monday.