Michael Vick has told federal investigators that he never used performance-enhancing drugs, but Plano, Texas, steroids trafficker David Jacobs told the Dallas Morning News before his death that he was Vick's supplier when the quarterback played for the Atlanta Falcons.

The News did not publish Jacobs' allegations against the NFL quarterback now with the Eagles because authorities at the time declined to confirm Vick was part of the Jacobs investigation.

But a newly released document shows that federal agents and prosecutors questioned Vick about steroids and human growth hormone while investigating his dogfighting ring in the fall of 2007. He denied using the drugs.

Agents asked Vick about an alleged encounter at the Falcons' 2006 Christmas party. Details of that event relayed by an informant to the Drug Enforcement Administration are similar to what Jacobs told the News after he began cooperating with federal agents and NFL investigators. Jacobs died in a murder-suicide in 2008.

Vick was never implicated in the case. His agent did not immediately return a phone call seeking comment yesterday.

Authorities said Jacobs ran one of the largest doping networks in the country before he was arrested in May 2007.

Colts injury. Rookie cornerback Jerraud Powers (foot) was downgraded to doubtful for today's AFC championship game against the Jets.