It was hoped that the stand, which will have a final capacity of close to 7,000 seats, would be ready for the start of next term, as exclusively revealed by the Daily Echo.
But the club has now confirmed a revised timeline for their stadium expansion plans.
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AFC Bournemouth have said that the full planning application, which became public at the end of January, will go to the BCP Council committee for approval in early May of this year.
Works have already begun on the enabling works for the stadium expansion, with plans for that phase of the project approved in January.
While the full south stand will not be completed for the start of next season, the lower tier will be ready for the season.
This will have 3,000 seats, while the south east and north west corners will be infilled, meaning an increase of capacity at the ground by more than 1,500 total seats.
The upper tier of the south stand will be constructed through the 26/27 campaign.
Works also planned to be completed by the start of next term include the relocation of all the turnstiles at the ground into a new perimeter, creating a larger concourse, as planned in the enabling works.
A new ticket office will become operational in that new perimeter, while an internal refurbishment of the east and west stands will be completed, adding three new hospitality areas.
There will also be updated media seating and improved broadcast facilities in the main stand.
Work on the remaining corner infills and the planned extensions to the north and east stands will start in the close season after the 26/27 campaign, to bring the stadium to a capacity of around 20,200.
This work remains subject to planning permission from the council.