It follows a crash on December 2, 2024, when a van drove into the base of the sculpture, leaving part of it broken and debris scattered on the ground.
No injuries were reported and no arrests were made.
The statue, which was made of glass mosaic and showed three entwined fish, links to the historic coat of arms of the town.
The fish are inspired by the De Luci family, who were granted land in the area after the Norman conquest.
The colourful design also represents the cleaning of the River Thames and Erith’s identity as a riverside town.
Following the crash, technicians and the artist Gary Drostle visited the site and the structure was declared safe to remain in place while repairs were considered.
Bexley Council has now confirmed the statue will need to be removed from the roundabout for a few months while restoration work is carried out.
In a statement, the council said: “We have been working with the artist to determine how best the repairs can be done.
“The structure is safe in its current state and we had hoped that we could restore the underlying framework without having to remove the sculpture.
“Unfortunately following various assessments and in agreement with the artist it has become clear that the sculpture will need to be removed from the roundabout for a few months to be rebuilt and restored.
“We are planning to remove it in September so that restoration can begin.”
