The ESRB, which is the North American ratings board, has assigned age ratings to the PS2 games for the second time this year.
Both titles have been rated separately, suggesting that they will be available individually from the PS2 Classics section of the PlayStation Store.
Rockstar is yet to confirm the news, and once again there is no sign of Grand Theft Auto: San Andreas.
PlayStation Vita compatibility is also a possibility, following a leaked listing earlier this year.
The commemorative Grand Theft Auto 3: 10th Anniversary Edition, meanwhile, was released on mobile devices late last year.
Available on multiple iOS and Android devices, the game featured updated visuals, as well as touchscreen controls and autosave functionality.
Watch the trailer for Grand Theft Auto III: 10th Anniversary Edition below: