The Rev. Jesse Jackson became the latest public figure to offer an opinion on the future of Michael Vick. Jackson said he wondered whether there had been collusion among N.F.L. owners to keep Vick out of the league.

“I want to make it an issue,” Jackson said Thursday in a telephone interview. “I want teams to explain why they have a quarterback who has less skills but is playing or at least is on the taxi squad, and a guy with more skills can’t get into training camp.”

Two years ago this month, Vick pleaded guilty to felony charges related to his participation in an unlawful dogfighting ring and was indefinitely suspended from the N.F.L. Vick was sentenced to 23 months in federal prison in December 2007.

He was conditionally reinstated to the league last month by Commissioner Roger Goodell. Under terms of the reinstatement, Vick can take part in preseason practices, workouts and meetings and may play in the final two preseason games  if a team signs him.