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Ex-MLB player David Segui could be reluctant witness against Roger Clemens

(CBS/AP) WASHINGTON - Former major leaguer David Segui is on the verge of having to testify in the Roger Clemens perjury trial, even though he doesn't want to.

Prosecutors want Segui to relate a conservation he had with Clemens' former strength coach, Brian McNamee, in 2001. McNamee supposedly talked to Segui about saving waste from injecting players in order to placate McNamee's wife.

That would be consistent with McNamee's testimony as to when and why he saved evidence after allegedly injecting Clemens with steroids that year.

U.S. District Judge Reggie Walton will rule Thursday whether Segui has to testify. When told Segui doesn't want to, the judge said: "If he doesn't show up, he'll be arrested like anyone else."

Clemens is accused of lying to Congress when he denied using performance-enhancing substances.

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Earlier Wednesday, the longtime head athletic trainer of the New York Yankees testified that he once wrote that Clemens "maintains complete confidence and respect" for McNamee.

Gene Monahan, who retired last year, took the stand Wednesday morning in the perjury trial of the 11-time All-Star pitcher. In 2000, Monahan wrote a letter to the Yankees manager and general manager about Clemens' relationship with McNamee.

At the time, the Yankees were hiring McNamee as an assistant strength and conditioning coach to specifically work with Clemens.

McNamee says he injected Clemens with steroids and human growth hormone.

Monahan testified that McNamee had no authority to give any type of injection and if he had been caught it would've been serious, CBS News producer Traci Caldwell reports.

The trial is in its sixth week. The government says it has four to six more witnesses to call.

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