FRISCO, Texas — The Dallas Cowboys signed left guard Tyler Smith to a $96 million, four-year extension on Saturday, two people with knowledge of the contract said.

The agreement, which could lock up the new cornerstone of the Dallas offensive line through 2030, includes $80 million guaranteed, the people told The Associated Press on condition of anonymity because terms were not released.

The $24 million annual average in the extension is the highest among guards in the NFL. Smith has two years left on his rookie contract.

“I think he’s the best guard in football,” first-year Cowboys coach Brian Schottenheimer said a day before the deal was reached. “I don’t think I’m overselling him. I really think he is.”

Smith is a game into his fourth season as a 2022 first-round draft pick. The 24-

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