The Bears are tied for first in the NFC North at 3-2 but know the Packers (2-2) are lurking and likely are still the favorites.
But the absence of Clay Matthews will change the landscape over the next month.
The Packers' start outside linebacker suffered a broken thumb late in his team's 22-9 win over the Detroit Lions on Sunday, and surgery will keep him out of action for at least the next month, first reported by ESPN's Adam Schefter. It's a massive blow to Green Bay's defense, which ranks 19th in total defense through five weeks.
Through four games Matthews has recorded 18 tackles, 3.0 sacks and two forced fumbles, and he sat out the second half of a Week 3 loss to the Bengals with a hamstring injury.
And the one-month timeline -- there's still a chance Matthews' season could be over depending on how he responds to injury -- would put Matthews' potential return in Week 9, when the Packers host the Bears on Monday Night Football on Nov. 4.
Jay Cutler has been sacked nine times through five games, tied for fifth fewest in the NFL. Still, Matthews has 7.5 sacks, 28 tackles and an interception in eight career games against the Bears. Losing one of the most feared pass rushers in the NFL would have a massive impact on that Week 9 matchup that could loom large in the standings by the end of the season.