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Sammy Igoe could also miss the weekend's game against the Foxes, he has picked up an illness.
Meanwhile, Adi Viveash is fit to play, an injury to his toe is not as serious as first feared.
The Royals are likely to miss Henderson up front, the big striker has come off the bench for all three of Reading's games so far this season.
Physio Jon Fearn told readingfc.co.uk the severity of his injuries: "Darius jumped and turned his ankle. There was a bit of swelling immediately, after examining it again this morning I think that he has damaged two ligaments.
"It isn't serious but it will keep him out for a week or so, maybe longer. The swelling has gone down since he obtained the injury, hopefully it will continue to do so and he'll be back as soon as possible."
The outlook for Sammy Igoe is much better, the winger has picked up a virus, he will be hoping that it isn't as bad as Nicky Foorster's that kept him bed-bound for two weeks.
Fearn added: "Sammy's quite unwell and will be seeing a doctor on Thursday afternoon. Fingers crossed he's only got a twenty-four hour thing, hopefully he'll be OK.
"Adi Viveash took a bang to his foot in the reserve game yesterday, he lost a nail and jarred all his other toes. But it isn't a problem and he will be fit for Satuirday."