GREEN BAY, Wis. — The Green Bay Packers strolled into Chicago for the season opener boasting a revamped defense with several expensive additions, and suffocated quarterback Mitchell Trubisky and the Bears’ offense.

Defensive coordinator Mike Pettine’s unit will see an entirely different challenge in running back Dalvin Cook on Sunday when the Packers (1-0) host the Minnesota Vikings (1-0), another NFC North foe.

Cook rushed for 111 yards and two touchdowns on 21 carries against the Atlanta Falcons last week. It was the third-year back’s third 100-yard outing in his 16th career game.

“Yeah, the run game, I mean it all starts, that running back, he’s an elite runner,” Packers coach Matt LaFleur said. “Dalvin Cook’s an elite runner, and they did a nice job up front. They took it to Atlanta, quite frankly, last week.”

When healthy, Cook has proven to be one of the prime runners in the league. But staying healthy has been the biggest challenge of Cook’s young career.

Cook, a 2017 second-round pick, played only four games as a rookie, suffering a torn ACL. Cook battled injury again last season, missing a chunk after a hamstring injury in a 29-29 tie at Lambeau Field in Week 2.

Cook said he’s not thinking about last season’s injury or last season’s tie.

“Different team, different mindset, different coaches, everything’s different,” he said. “You’ve got to expect different things. I can’t really talk about what we did last year.”

The Packers allowed just 46 yards on the ground in the opener, with inside linebacker Blake Martinez leading the team with five tackles and a sack. Outside linebackers Za’Darius Smith and Preston Smith and safety Adrian Amos, all acquired in March through free agency, combined for five tackles, 2½ sacks and an interception. The Smiths combined for 10 total quarterback pressures; Za’Darius Smith had six, which leads the league.

“The guys that they brought in are pretty good players,” Cook said of the Green Bay defense. “They kind of added some rangy, long guys. I think their defensive speed is a plus for them, and they kind of fly around. I think that’s what’s going to get their defense charged up. I think we’ve got to kind of limit that for those guys and match speed for speed. We can do that.”

Reunited

If there’s anyone who knows what to expect from Minnesota quarterback Kirk Cousins, it’s LaFleur. LaFleur was Cousins’ position coach in Washington in 2012 and 2013. Washington was LaFleur’s first stop in the NFL.

“If you let him sit back there and have time, he’s going to pick you apart because he’s extremely accurate,” LaFleur said of Cousins.

Cousins, who sent a congratulatory text message to LaFleur after the first-year Packers coach picked up his first career win in Chicago, played sparingly under LaFleur as Cousins backed up 2012 AP Offensive Rookie of the Year Robert Griffin III.