Don Jackson will be Packers' starting RB

GREEN BAY - On the day he was promoted from the practice squad, Green Bay Packers undrafted rookie Don Jackson will be the team's starting running back against the Chicago Bears.

Jackson was announced as the starter before the 7:25 p.m. kickoff against the Bears at Lambeau Field. He'll be joined in the backfield by fullback Aaron Ripkowski and tailback Knile Davis, who the Packers acquired through a trade with Kansas City. Receiver Ty Montgomery will likely get a healthy dose of snaps in the backfield, and fellow receiver Randall Cobb could join him.

Also active is receiver Davante Adams, despite being questionable with a concussion. Adams apparently passed through the concussion protocol Thursday. It's uncertain how much he'll play against the Bears.

Six of the Packers' seven inactives were ruled out Wednesday. They are cornerbacks Damarious Randall and Quinten Rollins, safety Chris Banjo, running back James Starks, tight end Jared Cook, receiver Jared Abbrederis and tackle Kyle Murphy. Eddie Lacy will need ankle surgery and was placed on injured reserve Thursday to make room for Jackson's promotion to the active roster.

Here are the Bears' inactives against the Packers:

• QB Jay Cutler
• WR Eddie Royal
• CB Deiondre’ Hall
• RB Jeremy Langford
• S DeAndre Houston-Carson
• LG Josh Sitton
• NT Eddie Goldman

rwood@gannett.com and follow him on Twitter @ByRyanWood