Vick quarterbacked the New York Jets to a 20-13 win over the Steelers in Game 10 last season after the Jets had started rookie Geno Smith the first nine games. Vick was released after the season but would fit in well behind Ben Roethlisberger because the Steelers' backup quarterbacks this preseason have been average at the very best.
In three games, Gradkowski and Landry Jones have posted a combined passer rating of 67.6 with Jones throwing 97 of the team total 119 times.
"I'll be happy with any person who can help this team," said Roethlisberger. "If that's Michael Vick, so be it."
Vick, 35, has spent 12 seasons in the league but his career was interrupted in 2008 by a 21-month jail term after he was implicated in an interstate dog-fighting ring that had operated for five years.
Roethlisberger, a dog owner who helps several police departments by funding their canine corps, was asked if Vick's past troubles would be a problem to him or anyone with the Steelers.
"No, this is a locker room," Roethlisberger said. "And this is about football. That's what matters to me."