Lenny Kravitz has shot down reports he is set to take over from Steven Tyler as Aerosmith frontman, insisting the singer is irreplaceable.

Tyler left the group earlier this year, announcing plans for a two-year hiatus, but his bandmates are determined to continue without him and are currently considering replacement singers for a 2010 album and tour.

Former Geffen Records executive John Kalodner, the man behind the legendary group's 1980s comeback, recently urged the crestfallen Aerosmith bandmates to sign Kravitz to take over from Tyler.

But although the rocker is "flattered" by Kalodner's comments, he's adamant he would never consider stepping into Tyler's role.

On his Twitter.com page, Kravitz writes, "As much as I am flattered that Aerosmith's camp would consider me to front the band, Steven Tyler is a family friend, and no voice could ever take the place of his. I hope the band stays together. They are classic."