The singer has been tipped to headline the show at London's O2 Arena on February 20, after organisers are convinced he will walk away with the 'Best British Male' award.
A Brits spokesperson told the Daily Star that nothing has been finalised, but a source said Williams would return to celebrate his career and recent successes.
The Take That star was branded "too old" for Radio 1's playlist last year, after the station justified not spinning his 2012 single 'Candy'.
However, the star still hit the top of the UK charts with the cut, while his latest album Take the Crown followed suit.
The nominations for the Brit Awards 2013 will be announced at a show in London on January 10.
Watch the music video for Robbie Williams's 'Candy' below: