Martin is expected to accompany Gallagher on stage during his performance slot at the ceremony, which will take place at London's O2 Arena on February 21.
Brit Awards host James Corden let slip of the collaboration during an interview on BBC Radio 2.
He said: "I think - and I don't know if this is true and I'm almost certain that I'm not supposed to tell you - that Chris Martin is going to accompany [Noel Gallagher] on the piano."
Coldplay are up for 'British Album Of The Year' and 'British Group' at the ceremony, while Gallagher will compete for 'British Male Solo Artist'.
Adele, Olly Murs, Florence + the Machine, Ed Sheeran and Bruno Mars have also been confirmed to play this year's Brit Awards.
> Brit Awards 2012 nominations: Florence + the Machine, Coldplay, more
> The Brit Awards 2012 - Who should win?
Watch Chris Martin and Noel Gallagher perform Oasis's 'Live Forever' at a charity gig in 2002 below: