The doctor at the centre of a steroid investigation involving current and former Carolina Panthers players had his licence suspended.
The South Carolina Board of Medical Examiners issued a temporary suspension this week against Dr James Shortt.
The board said the alternative practitioner is "unfit to practice
medicine" and called him a "serious threat" to public health.
The suspension order said Shortt prescribed the steroid testosterone to four unidentified male patients "in doses and frequencies that were extremely unlikely to have been prescribed with any legitimate medical justification".
A recent CBS News report claimed that three Panthers players had prescriptions from Shortt for banned steroids less than two weeks before the team played in the 2004 Super Bowl.
Medical board spokesman Jim Knight declined to say whether the four males cited in the suspension order were Carolina players.
Shortt, who denies any wrongdoing, has until 27 April to request a hearing contesting the suspension.
The board said it will continue its investigation and decide whether his licence should be permanently revoked.