MILWAUKEE, Wisc. -- The Green Bay Packers made it official and placed running back Ryan Grant on injured reserve Tuesday, effectively ending his 2010 season.
The Packers failed to disclose the exact nature of the injury, but the Milwaukee Journal Sentinel reported earlier Tuesday Grant tore a ligament that holds two bones in his ankle and that surgery is required.
Packers coach Mike McCarthy had ruled Grant out for at least Sunday's upcoming game against Buffalo at Monday's press conference, where he called the injury only "significant." He had said additional testing was needed before an exact diagnosis could be made.
"When you lose a running back of Ryan's caliber, it's a big loss. But this is something we have to deal with and move forward from as a team. We have confidence that our other players will step up and meet the challenge of these losses," said Packers general manager and director of football operations Ted Thompson.
Grant limped into the locker room before halftime and did not return to Green Bay's eventual 27-20 win over Philadelphia. The injury was originally termed a sprain.
Brandon Jackson filled in admirably for Grant the rest of the way and was named the starter against the Bills. The fourth-year pro out of Nebraska rushed for 63 yards on 18 carries and caught two passes for 12 yards Sunday. He will now presumably fill Grant's shoes for the rest of the year.
"I feel Brandon Jackson carried the load yesterday. I think there's a lot of evidence right there, recent evidence that he's able to play all three downs, and he will have that opportunity this week vs. Buffalo," McCarthy said Monday. "I thought it was a good solid performance for Brandon. Broke a lot of tackles. We had four explosive runs, which is outstanding and that's a big credit to Brandon."
Green Bay also placed defensive end Justin Harrell on injured reserve with a knee injury and signed running back Dimitri Nance off the Atlanta Falcons practice squad and defensive end Jarius Wynn.
Nance originally joined the Falcons as a non-drafted free agent out of Arizona State. Wynn appeared in 11 games as a rookie last season for Green Bay. He was part of the Packers' final roster cut on Sept. 4.