NEW YORK (WFAN/AP) — Former Yankees first baseman Jason Giambi and his brother testified that Barry Bonds’ personal trainer supplied them with performance-enhancing drugs.

The two on Tuesday were the first athletes called to testify at the Bonds perjury trial, which is in its second week.

Appearing calm, Jason Giambi testified that he met trainer Greg Anderson after the 2002 season, his first with New York, while both were traveling through Japan with a U.S. all-star team.

When they returned to the U.S., Anderson had Giambi’s blood tested and it turned up positive for a steroid that Major League Baseball was planning to test for during the 2003 season.

“Anderson told me that would trip a Major League Baseball test and that I should take something else,” Giambi said.

Giambi said he paid Anderson a total of about $10,000 for several shipments of steroids known as “the clear” and “the cream” designed to evade detection starting in late 2002 and through the beginning of the 2003 MLB season. Syringes and a calendar detailing when he should take the substances were included in the first shipment, Giambi testified.

“The clear” turned out to be Tetrahydrogestrinone (THG) and “the cream” was a testosterone-based substance.

During cross examination, Bonds attorney Cris Arguedas read Giambi’s 2003 grand jury testimony when he testified that Anderson had told him “the clear and the cream had steroid-like effects without being a steroid.”

Giambi agreed with that testimony.

Bonds lawyer Allen Ruby said Bonds used the designer steroids, but believed Anderson when he told the slugger they were legal supplements.

Giambi’s brother, Jeremy Giambi, testified similarly. Jeremy Giambi played for four MLB teams during a five-year career that ended in 2003.

Neither Giambi provided direct testimony about Bonds. Instead, prosecutors hope to use their testimony — and that of other players — to show that Anderson was a well-known steroids dealer. Anderson is in jail for refusing to testify at the trial.

Several other athletes are expected to testify about their relationship with Anderson this week.

Bonds, the MLB record-holder for home runs in a career (762) and a season (73), has pleaded not guilty to four charges that he lied to a grand jury when he denied knowingly taking performance-enhancing drugs. He also pleaded not guilty to a charge of obstruction.

Before the Giambis’ testimony, former San Francisco Giants trainer Stan Conte testified that Bonds added significant muscle mass before the 2000 season. Conte said he noticed acne on the slugger’s back, which prosecutors allege is a side effect of steroid use.

Conte, who was now the Los Angeles Dodgers head trainer, told the jury that Bonds viewed him and the medical department as “spies” for the owners.

Conte said he suggested to general manager Brian Sabean and manager Dusty Baker at spring training in 2000 that Bonds’ trainers, Anderson and Harvey Shields, should be barred from the Giants training room and clubhouse.

Conte said that Sabean told Conte to evict the trainers himself. Conte testified that Sabean remained silent when he asked the general manager to back him if Bonds complained. Conte testified that he understood from Sabean’s silence that he didn’t have the general manager’s backing and he dropped the subject.

Sabean said on Tuesday he wasn’t able to comment.

(TM and Copyright 2011 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2011 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)