Randall Cobb

Packer RB Eddie Lacy's season just took a massive hit.

Lacy will need to undergo ankle surgery and will head to injured reserve, a source informed told NFL Network Insider Ian Rapoport.

Rapoport reported that the injury is "more than an ankle sprain," and that after a second opinion, surgery on it was a necessity.

Related players: Ty Montgomery, Randall Cobb, Knile Davis, Don Jackson, James Starks

We already knew Lacy was out tonight and the backfield picture would be a cloudy one with Ty Montgomery, Randall Cobb, Knile Davis and Don Jackson possibly all seeing action. We think Montgomery's stock climbs the most after 10 catches in Week 6, but as we reported Wednesday, Jackson was also working with the first team on Tuesday. Davis, just picked up in a trade this week, will probably be limited because of not being familiar with the playbook. James Starks is expected to miss several weeks with a knee injury.