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The Chargers have never won five in a row under coach Jim Harbaugh, but they have a chance to do so Saturday. It won’t be easy against this Houston Texans defense, ranked No. 1 in the NFL.

The Texans crushed the Chargers in the first round of the playoffs last season, intercepting Justin Herbert four times in a 32-12 drubbing.

Now, the Texans are riding a seven-game winning streak and haven’t dropped a game since a three-point home loss to Denver at the beginning of November.

The Chargers clinched a playoff berth this week but are looking for more than a wild-card spot. If they win Saturday, the AFC West title — and at least one more game at SoFi Stadium — is within reach. Even the AFC’s No. 1 seed is in play.

How the Texans can win: Houston’s defense can hold up against the run and has the secondary to challenge Herbert, but the Texans offense has been one of the league’s worst in the red zone. The Texans need to convert those opportunities into touchdowns. C.J. Stroud is at his best throwing between the numbers when protection holds, although he has a suspect offensive line, and the Texans will lean on short passes to compensate for a shaky running game. Forcing a turnover or two is critical. Houston thrives when it shortens the field and avoids asking the offense to sustain long drives. Field goals alone won’t be enough.

How the Chargers can win: Control the game with balance and patience. Houston’s defense is opportunistic and excellent at forcing turnovers, but it can be stressed if Herbert has time and the Chargers stay committed to the run. That won’t be easy if Kimani Vidal is out. Even modest success on the ground forces the Texans to respect play-action fakes and opens throwing lanes, particularly over the middle. Herbert’s ability to escape pressure and run, especially up the middle against man coverage, could be a hidden weapon late. If the Chargers protect the ball and finish drives instead of settling for field goals, they can keep Houston from dictating the tempo.

It’s a testament to the coaching of Jim Harbaugh that the Chargers have been decidedly un-Charger-like this season, continuing to win games despite a slew of pivotal injuries. They’re coming off back-to-back victories over the two teams in last season’s Super Bowl, Philadelphia and Kansas City.

Their challenge Sunday is beating the Cowboys, who went 3-1 in November but began this month with consecutive losses.

The Cowboys lead the league in offense, rolling up nearly 400 yards per game, but they’re 29th in total defense and last against the pass. Facing Justin Herbert is not a favorable matchup for them.

Dallas was eliminated from postseason contention with a Week 15 loss to Minnesota.

The Chargers can clinch a playoff berth with a win and a loss or tie by Indianapolis (versus San Francisco) or Houston (vs. Las Vegas).

How the Chargers can win: If Herbert has time, he should be able to dissect a suspect Cowboys secondary and relies heavily on zone coverage. That has led to a bunch of explosive plays. The Cowboys are vulnerable to the run, as well, and a balanced attack by the Chargers will take them a long way. Get another strong performance from the defense.

How the Cowboys can win: Be aggressive and play to win, not to protect leads. That means outscoring the Chargers, not settling for field goals because Brandon Aubrey is such a weapon. It would help the Cowboys to take some risks and go for it on fourth down more frequently. They can put points on the board, but more often they move the ball well between the 20s. Even a small improvement on defense would help.

Sweeping the Las Vegas Raiders is one thing, but can the Chargers do the same against the mighty Kansas City Chiefs?

With the way Patrick Mahomes & Co. have played lately — losing four of five and in danger of missing the playoffs for the first time with Mahomes — that’s entirely possible.

The Chargers need to win at least one of their final four games to get to double digits and put themselves in position to make the playoffs, and it’s a brutal stretch — at Kansas City and Dallas, home against Houston, and a finale at Denver. They could check that box Sunday, having won five of their last six games.

How the Chargers can win: The Chargers need to ratchet up the pressure on Mahomes, particularly off the edges, and test an offensive line that has been in a steady rotation and is suspect at the tackle spots. Take advantage of the inconsistency at receiver and the propensity for drops. The secondary led the way in the win over Philadelphia. Win on early downs to get into third-and-manageable and don’t fall behind in what can be one of the loudest stadiums in the league. Keep Chris Jones and the rest off of Justin Herbert, who still is recovering from surgery on his left hand. Continue to pound the ball with Omarion Hampton and Kimani Vidal.

How the Chiefs can win: The Chiefs need to win out, and to do that they must get out of their own way. Too many times they have fallen victim to mistakes — drops, penalties, missed assignments, defensive lapses. It’s like a bizarro version of the team that went 11-0 in one-score games last season. As great as he is, Mahomes can’t get happy feet the way he has too often. Kansas City needs to do a better job of giving him a clean pocket. The Chiefs need to tighten up on defense late — that has been a problem — and limit turnovers. They’re in a loud stadium and the cold weather plays to their advantage.