The College of Physicians and Surgeons of Ontario announced Tuesday it will investigate the medical practice of George M. (Jamie) Astaphan, the personal physician for disgraced Canadian sprinter Ben Johnson.

Sports Illustrated magazine quoted sources this week as saying Astaphan provided performance-enhancing steroids to Johnson. The Toronto sprinter was stripped of his gold medal in the 100-meter race at the Seoul Olympics on Monday when a urine sample tested postive for the banned drug.The announcement of the investigation came following a meeting between Astaphan and college officials. Astaphan's lawyer also attended the meeting, a college spokesman said.

Sports Illustrated said Johnson received injections of anabolic steroids in late May from Astaphan on the Caribbean island nation of St. Kitt's.

The magazine identified the physician as Astaphan, from whom Johnson had sought treatment for a hamstring pull suffered 10 days earlier.