Things to Watch is adapted from a conversation between Voice of the Texans Marc Vandermeer and Sideline Analyst John Harris.

THREE THINGS TO WATCH: TEXANS VS. 49ERS

As the Houston Texans prepare to host the San Francisco 49ers on Sunday, here are three critical factors that could determine the outcome at NRG Stadium.

1. STOPPING CHRISTIAN McCAFFREY

The 49ers' star running back presents a dual threat that keeps defensive coordinators awake at night.

"Christian McCaffrey. And I know you agree with me. And if the question is, well, you're more worried about his running or is receiving the answer is yes, because he does it all so well," Marc Vandermeer said.

The numbers tell the story of McCaffrey's versatility.

"His 53 receptions on the year. So let me do the math for you. That's a lit

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