The audience at the Kings of Leon in Slane last year. Photo: Enda Casey.

Speculating is mounting as to who will headline next year's Slane Concert, as Lord Henry Mountcharles prepares to host a press conference at his ancestral home on Tuesday.

The headline act is expected to attend Tuesday morning's conference.

Earlier this year, Lord Mountcharles, indicated that while there wouldn't be a concert in Slane in 2012, there was a possibility the castle would host two concerts in 2013.

Speculation is rampant as to who will headline the concerts. The Rolling Stones have reformed for a series of reunion gigs, two in London and two in New Jersey, but have already played Slane twice, most recently in 2007.

Others, like U2, The Script, Coldplay, Red Hot Chili Peppers and Green Day are also being mentioned.