World Ruled out at Navan
Rule The World
(Healy Racing Photos)
Mouse Morris' gelding looked set to be a strong second string in the feature event for owners Gigginstown, who also have short-priced favourite Don Cossack.
Gordon Elliott's charge will now face just four rivals in the two-and-a-half mile event and has hardened into 1/2 favourite (from 8/13).
Muirhead is also an absentee from the Grade 2 Tara Hurdle.
Mouse Morris is set to saddle both Hennessy Gold Cup third First Lieutenant and the returning China Rock in the Lexus Chase at Leopardstown on December 27th.