The investment bank founded by Thomas Weisel, the powerful Silicon Valley financier who bankrolled and owned Lance Armstrong's former cycling team, also managed assets for the then-head of cycling's governing body, according to a broker who handled the accounts.

The 71-year-old Weisel is under scrutiny in the doping scandal that has engulfed Armstrong's former U.S. Postal Service cycling team.

A federal whistleblower lawsuit filed in 2010 by Armstrong's former teammate, Floyd Landis, accuses Weisel—as well as Armstrong and others—of knowingly duping the Postal Service, which sponsored the cycling team he owned, by covering up doping on the team, according to people familiar with its contents.

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