The former Liverpool player, 25, is set to have an operation on Friday in the United States.
Carroll picked up the problem on the Hammers' tour of New Zealand, reporting a sore left ankle in training.
He tweeted: "Going under the knife tomorrow morning and absolutely devastated to be missing the start of the season."
Jack Sullivan, son of co-owner David, tweeted details of the extent of the injury on Thursday following a question and answer session with his father.
He wrote: "Very bad news regarding AC. Torn ligaments in ankle. Operation tomorrow with top surgeon in USA. Will be playing in four months."
The club only discovered the full extent of the injury on Thursday evening.
Carroll missed West Ham's 2-1 defeat at the hands of Wellington Phoenix and the club announced he would miss the rest of the tour.
He has been plagued by injury since moving to Upton Park for a club record £15m from Liverpool after impressing during a loan spell.
He missed the majority of 2013-14 with a heel problem - managing just 15 league appearances - and also failed to force his way into England's World Cup squad.
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