Manager Sam Allardyce confirmed the details of the problem in his Friday press conference and it has since been confirmed the England forward will undergo surgery next Tuesday.
Carroll left Southampton on crutches on Wednesday night following West Ham’s 0-0 draw, in which the striker came on as a second-half substitute.
Following a meeting with a specialist, surgery and a prolonged period of rehabilitation was diagnosed.
A statement on the club’s official website read: “The recovery phase is expected to keep Carroll out for the remainder of the 2014/15 season.”
Manager Sam Allardyce said: “It is traumatic when someone is going through a period when in a short time they overcome one injury and another occurs.
“It’s a completely new injury. We thought it might be a recurrence of the old one but unfortunately for Andy it is a new one and it looks a lot more serious.”