"The work will be carried out without it being taken down. A frame has been erected around the monument," Vladimir Timofeyev said.
The monument to the communist leader, near St. Petersburg's Finlyandsky railway station, was badly damaged following an explosion on Wednesday that caused a large crater and a hole in the statue.
Authorities had earlier ordered the monument be dismantled to carry out restoration work, after fears the statue could collapse. The work is expected to cost up to 8 million rubles ($236,000).
The Communist Party of Russia expressed its outrage at the explosion, describing it as "a politically charged act of vandalism." Members of a number of Russian political parties, including the communists and Yabloko, will gather in St. Petersburg at the weekend to protest the damage.
The bronze monument to Lenin was unveiled on November 7, 1926 at the site, where the Russian communist leader made a prominent speech after returning from exile in 1917 just prior to the Russian Revolution. The statue was later moved closer to the Neva River.
The 10-meter high bronze statue is one of the few remaining Soviet-era Lenin monuments to have survived the political changes in St. Petersburg. Residents of Russia's second-largest city protected it from artillery fire during WWII.
