This is the only game this week that features two teams each needing wins to stay in the race. The Texans are in a tough fight in the AFC South, trailing both the Colts and Titans, but only a game out of first place—they're 4-3.
After beating the Colts in Week 1, the Texans lost to them on the road on Monday night, but right now own the better division record. If the Colts and Titans were to lose and the Texans win, Houston would be in first place.
But, they also need to win this game in order to not decrease their playoff chances. This game will be in Houston and if the Texans were to lose, it could potentially drop them below the Jaguars into last place.
As for the Chargers, they're in a tougher position. They've been one of the more disappointing teams in the league so far at 3-5, although the AFC West is not necessarily strong.
The Chargers are still better than both the Chiefs and Raiders. With that being said, they do have losses to both of those teams and that makes the task even tougher.
The Wild Card is definitely not coming out of the AFC West, so winning the division is imperative. Dropping to 3-6 will certainly not help and winning in Houston is certainly not easy.