"The intention is to pay tribute to Freddie and the band by singing some fucking great songs," he said. "It's to keep the music alive for the fans and give it an energy that Freddie would've been proud of." Queen previously toured with former Bad Company singer Paul Rodgers taking Mercury's place.
Speculation has been high since Lambert was joined by surviving Queen members Brian May and Roger Taylor during his Idol finals appearance in 2009. In November, they performed together at the MTV EMAs in Belfast.
Lambert said he had no intention of replacing Mercury, who died in 1991. "That's impossible," he said. "The way I'm choosing to view it is that it's a great honor and one I'm in no way going to shirk." Lambert's second solo album, Trespassing, is due in March.
A representative for Hollywood Records tells Rolling Stone, "The Daily Star item only mentions that Adam may perform with Queen at Sonisphere. This is not confirmed. Nothing has been signed. However, if this were to happen, Queen would be returning to the setting of their final concert with Freddie Mercury, which took place in 1986."
Lambert took to Twitter to clarify his comments. "Them clever reporters takin my quotes outta context ... I haven't confirmed any guest appearances. I was talking about the EMAs," he tweeted. "That being said, I'm truly flattered by your jump to such glorious conclusions."