GREEN BAY, Wis. – Mike McCarthy would like another running back before the Green Bay Packers have to play Thursday night against the Chicago Bears.

But it’s not as simple as promoting Don Jackson from the practice squad or signing someone off the street.

So it’s entirely possibly he might have to make do with the same setup he had in Sunday’s loss to the Dallas Cowboys, when Eddie Lacy – on a tender left ankle – played as much as he could and got moments of rest when the Packers used their “Big Five” package (an empty-backfield, five-receiver set) for the first time all season and also sprinkled in Randall Cobb and Ty Montgomery as makeshift backs.

The Packers also are in a difficult spot at cornerback, where they could be without their top three on the depth chart – Sam Shields (concussion), Damarious Randall (groin) and Quinten Rollins (groin).

“It’s never, ‘Give me another running back,’ or ‘Give me another corner,’” McCarthy said Monday. “Because it’s a long year. You have 53 [on the roster], plus you’re counting practice-squad guys. That is the chess match right there. If you’re talking about chess match in the game of football, it’s managing your roster.”

Lacy’s status could impact that, too. McCarthy couldn’t say whether Lacy’s ankle was any worse after his 17-carry, 65-yard performance against the Cowboys. Lacy was still undergoing tests on Monday, McCarthy said. He also confirmed that James Starks had knee surgery on Sunday, which rules him out again this week.

“Well, you definitely want to,” McCarthy said when asked if he’d like another running back this week. “It just depends on how you want to play the game. How they line up and what they have on the other side of the ball factors into that, too. It’s a long year. If you start making roster moves, it’s just really never one factor that factors other positions. Because, frankly, you have players that you may have to jeopardize putting out there."

Their experience last week when they cut quarterback Joe Callahan was the perfect example of that. The Packers wanted to bring back the rookie on the practice squad but lost that chance when the New Orleans Saints claimed him off waivers. The Packers made two major roster moves last week, releasing Callahan and defensive tackle Brian Price to add defensive end Mike Pennel and cornerback Demetri Goodson off the suspended list.

“The plan with Joe was to be here,” McCarthy said. “And you take that chance, you accept that risk, and that’s what happens. So those are things that you have to weigh in. We had an ongoing three- or four-day conversation last week, and it’ll be the same here. We’ve just got less time to do it.”

McCarthy also said right tackle Bryan Bulaga (back) and receiver Davante Adams (blow to the head) are still being evaluated. He said he expected Bulaga to play because “it’s going to take a big, big injury to keep him out of a football game.” McCarthy did not confirm what Adams told ESPN.com after the game, that he did not have a concussion, but said, “I was told he’s feeling pretty good. That’s the only thing that they told me.”