Barry Bonds failed a test for amphetamines last season and originally blamed it on a teammate, the Daily News reported Thursday.
When first informed of the positive test, Bonds attributed it to a substance he had taken from teammate
Mark Sweeney's locker, the New York City newspaper said, citing several unnamed sources.
"I have no comment on that," Bonds' agent Jeff Borris told the Daily News on Wednesday night.
"Mark was made aware of the fact that his name had been brought up," Sweeney's agent Barry Axelrod told the Daily News. "But he did not give Barry Bonds anything, and there was nothing he could have given Barry Bonds."
Bonds, who has always maintained he never has tested positive for illegal drug use, is already under investigation for lying about steroid use.
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Under baseball's amphetamines policy, which went into effect last season, players are not publicly identified for a first positive test. A second positive test for amphetamines results in a 25-game suspension. The first failed steroids test costs a player 50 games.