Shayne Graham, who was signed on Saturday, will be the Giants' kicker.
Tynes sprained his left (non-kicking) ankle on Friday during practice. He tested the ankle on Saturday but was unable to do much during the team's walk-through. The Giants then signed Graham to cover themselves and placed popular rookie wide receiver Victor Cruz on season-ending injured reserve.
Graham, 32, spent the past seven seasons with the Cincinnati Bengals. The 10-year veteran has converted 196-of-230 (85.2 percent) of his field-goal attempts.
The Giants special teams has been a major concern for head coach Tom Coughlin this season. Tynes, who has gone 5-for-8 on field goal attempts, actually was the most consistent performer on special teams. Rookie punter Matt Dodge has been inconsistent and the special teams coverage and return game have been shaky for the majority of the season.
Wide receiver Calvin Johnson, who has been nursing a sore shoulder, is active for the Lions.