One of the sources said Peterson has notified Oklahoma coach Bob Stoops that he plans to turn pro and another said the player has met with agents, including Eugene Parker, Drew Rosenhaus and the Creative Artists Agency, the Dallas Morning News reported Thursday.
Monday is the final day for underclassmen to declare their eligibility for the draft.
Peterson, who has faced a broken collarbone as well as shoulder and ankle injuries during his three seasons with the Sooners, will leave the school with 4,045 yards and 41 career touchdowns, one of the best records in the history of the school. The running back was named runner-up for the Heisman Trophy in 2004.
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