During the festival's official press conference this weekend, Galbraith revealed that they were already in talks with the bands about making an appearance.
'They're both two that we're talking to, amongst a whole list of others," he revealed. "I also think we could have Green Day and Blink-182 here, but none of those are confirmed."
In addition, Galbraith confirmed that next year's Sonisphere Festival in the UK will take place between July 6 and July 8, and said that organisers have no intention of increasing the festival's capacity in 2012.
"We're not looking for it to become a mega festival," he added. "We're not looking to create a 100,000 capacity festival."
This year's Sonisphere Festival has been headlined by Metallica, Biffy Clyro and Slipknot.
Tickets for Sonisphere 2012 will go on sale from July 13.