The admission in the book "Open" will appear in excerpts scheduled to appear in Sports Illustrated in People this month, the Daily News reported.
"Those excerpts contain revelations about Andre's use of crystal meth when he was a tennis player," said Paul Bogaards, director of media relations at Knopf, the newspaper reported.
The information was first reported by Sports Illustrated writer Richard Deitsch in a Twitter post, ESPN and the Daily News reported.
Click for related content Poll: Does this change your opinion of Agassi?
Agassi, 39, is married to former tennis star Steffi Graf. They have two children. He won eight major Grand Slam titles.
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