Hamilton, 58, expressed reservations about how Tyler's new gig would affect the band's recent creative resurgence. But, he said, he did not want to stand in the way of the unique opportunity.
"Steven is someone who absolutely lives to be in front of an audience, and the people closest to him know how witty and entertaining he can be," Hamilton told the newspaper. "I don't know if American Idol will be rock 'n' roll enough for him, but it is an opportunity for millions of people to see another side of Steven Tyler."
Tyler, 62, underwent treatment for an addiction to painkillers in December.
Fox reps declined to comment.