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Having also missed a large part of the 2013-14 campaign, the latest setback is a blow to both the £15 million striker and Allardyce, and the Hammers boss admits Carroll is struggling to deal with his latest fitness blow.
"He is pretty miserable," Allardyce told reporters.
"He is not very happy with life at the moment because it is a massive blow to him again. We just have to pick his spirits up.
"Hopefully when the boot comes off and the specialist gives him the okay to start working again he will feel a lot happier with himself.
"But he is certainly very upset and very miserable at this moment in time."
Ecuadorian forward Enner Valencia joined the club for a fee of £12m earlier this season, but he too will miss the start of the campaign.