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Canseco writes that he personally injected Mark McGwire with steroids and that he saw McGwire and Jason Giambi inject each other, according to the paper.

The long-awaited "Juiced: Wild Times, Rampant 'Roids, Smash Hits, and How Baseball Got Big," is scheduled for release by Regan Books on Feb. 21. Regan publicist Paul Olsewski told The Associated Press in an e-mail that the release date could be moved up.

Parent company HarperCollins posted a book description on its Web site that said Canseco "made himself a guinea pig of the performance-enhancing drugs" and added the 1988 AL MVP "mixed, matched and experimented to such a degree that he became known throughout the league as 'The Chemist.' "

McGwire, who has long denied steroid use, said in a statement to the Daily News: "I have always told the truth and I am saddened that I continue to face this line of questioning. With regard to this book, I am reserving comment until I have the chance to review its contents myself."

Canseco claims he introduced the performance enhancers to Rafael Palmeiro, Ivan Rodriguez, and Juan Gonzalez when he joined the Rangers in 1992.

Canseco also writes that President Bush "had to have been aware" of rampant steroid use on the Texas Rangers when he owned the club in the early 1990s, the Daily News reported.

The White House had no comment on Canseco's specific allegation, but did say the President called on leagues and players unions to eradicate steroid use in his 2004 State of the Union address.

Giambi's agent, Arn Tellem, took issue with Canseco's credibility.

"This book, which attacks baseball and many of its players, was written to make a quick buck by a guy desperate for attention, who has appeared on more police blotters then lineup cards in recent years, has no runs, no hits and is all errors," Tellem told the Daily News.