The star eight-year-old is hot favourite for the two-mile championship, but was reported to be lame on Monday morning due to pus in his foot.
However, overnight treatment appears to have worked and Henderson reports his charge to be fit for action.
He tweeted: "Pleased to report that Altior is perfectly sound this morning so it's all systems go for him in the Champion Chase."
However, stable stalwart My Tent Or Yours has been ruled out of Tuesday's Unibet Champion Hurdle.
Henderson added: "My Tent Or Yours is a non runner in the Champion Hurdle today on veterinary advice."
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