Patrick Arnold, a chemist who worked with the Bay Area Laboratory Co-Operative, said in an HBO Sports interview that he believed Barry Bonds and Gary Sheffield took performance-enhancing drugs provided by the laboratory.
Arnold is widely credited with creating "the clear," a previously undetectable steroid. In 2006, he pleaded guilty to conspiring to distribute steroids.
On Costas Now, which aired Tuesday, Arnold told host Bob Costas he never met Bonds but often heard BALCO founder Victor Conte raving about Bonds' performance on "the program."
When asked if "the program" included steroids, Arnold said: "I have a very strong feeling about it since he was on the program. And like everyone else, the program consisted of the clear."
In a statement, Conte denied telling Arnold he gave Bonds steroids.
Asked about Sheffield's recent statement that he never took steroids because "they are something you shoot in your butt," Arnold said: "That's some sort of weird rationalization. No, he took steroids. This is a bona fide anabolic steroid."
Sheffield told the Detroit Free Press he didn't know Arnold. He said he used a substance provided at a 2001 offseason workout with Bonds, then cut off ties.
On the same program, Red Sox RHP Curt Schilling said he believed that Bonds' and Mark McGwire's refusals to address accusations of steroids use are tantamount to admissions. "If someone wrote that stuff about me and I didn't sue their (butt) off, am I not admitting that there's some legitimacy to it?" he said.
COOLBAUGH AUTOPSY: A preliminary autopsy report shows that a burst blood vessel in Mike Coolbaugh's neck, near his brain, killed the Tulsa Drillers hitting coach when he was hit by a batted ball Sunday. "It hit him in the back of the left side of his neck, kind of right below the ear," Pulaski County (Ark.) coroner Mark Malcolm said.
BREWERS BOOST PEN: Milwaukee acquired RH reliever Scott Linebrink from the Padres for three minor-league pitchers. Linebrink will be a setup man for closer Francisco Cordero. The Padres acquired RHP Will Inman, LHP Steve Garrison and LHP Joe Thatcher.
A'S: SS Bobby Crosby went on the disabled list with two nondisplaced fractures in his left hand.
ORIOLES: RHP Chris Ray, a former Hillsborough High standout, went on the disabled list with a sore elbow.
YANKEES: DH Jason Giambi is set to start a minor-league rehab assignment Friday night with Class A Tampa and hopes to rejoin New York next week after playing two games with the Florida State League affiliate.