The Week 17 NFL schedule continues on Saturday with two more games, both involving teams in the playoff mix. Chargers vs. Texans is set for 4:30 p.m. ET, followed by a must-win game for the Ravens as they take on the Packers at 8 p.

If Chicago is going to pull off this road win, they're going to need a strong showing from their defense to contain the 49ers' red-hot offense that hasn't punted since late November. Here's a look at three keys for the Bears defense as they battle the 49ers on Sunday Night Football: The Bears run defense is one of the team's biggest weaknesses as they're allowing an average 131 yards per game.