Nagy acknowledged that Jackson, who on Friday was named first-team All-Pro by Associated Press, could play despite not being 100 percent.

"There's a chance of that," Nagy said. "The hard part is where he's at, and we've dealt with this before is just trying to see, 'OK, if he's 'X' percent, whatever that is, is that something that is smart for him, is that smart for the team?'

"Whatever decision we make, for that game-time decision, we're going to have no regrets. So if he goes in and plays at 'X' percent, then that's it. And if he doesn't play, then that's the decision we made. We've had that rule this whole time and I just think it's going to be important to communicate with him and see where he's at and just see up until that time how it's going to be."

Unable to play the last two games of the regular season in San Francisco and Minnesota due to the injury, Jackson was replaced in the starting lineup by third-year pro Deon Bush.

In other injury news, outside linebacker Aaron Lynch (elbow) did not practice Friday and is doubtful for Sunday's game. Safety DeAndre Houston-Carson (ribs) also did not work out and is questionable. Defensive tackle Bilal Nichols (knee) was limited and is questionable.

Right guard Kyle Long and receivers Allen Robinson II, Taylor Gabriel and Anthony Miller all practiced without restrictions and were removed from the injury report.

Team leaders: The Bears have anointed six captains for the playoffs, as voted by their teammates: quarterback Mitchell Trubisky and center Cody Whitehair on offense; defensive tackle Akiem Hicks and outside linebacker Khalil Mack on defense; and Tarik Cohen and Benny Cunningham on special teams.

"That's just something that I've been a part of with coach [Andy] Reid how he's done that, so I liked it," Nagy said. "I thought it was good. It's a fresh start for these guys and anytime you incorporate the players making the votes, it speaks volumes of who those captains are. It's not selected through coaches or favoritism, so it's who the players selected. I think it's a pretty neat idea, so I just decided to stick with it."

Mack called it "another great honor."

"I'm a team guy, so that means a lot to me," Mack said. "Being in that position, I want to lead these guys, especially in the postseason."

Roster move: The Bears on Friday signed linebacker Jameer Thurman to a reserve/future contract. A Chicago-area product who attended Proviso West High School, Thurman spent the past two seasons in the Canadian Football League with the Calgary Stampeders.