Owner Robert Waley-Cohen said he was "mystified" over rumours suggesting all is not well with his defending Betfred Gold Cup champion Long Run.
The Nicky Henderson-trained seven-year-old opened his account for the season in the Denman Chase at Newbury last month and has been ante-post favourite to retain his crown all season, despite losing twice to Kauto Star.
With doubts surrounding Kauto Star's participation, Long Run had hardened at the head of the market and had been even money with Ladbrokes.
However, a slight drift on the exchanges on Monday evening prompted Ladbrokes to suspend their betting and when they reopened the market on Tuesday Long Run had been pushed out to 6-4.
Waley-Cohen reported on Twitter, however, that Long Run had taken part in his usual routine on Tuesday morning.
"Mystified by Long Run poorly rumours. Worked as normal today. All systems go," he said.