MINNEAPOLIS — Running back Adrian Peterson has agreed to a long-term contract extension with the Minnesota Vikings.

The Vikings announced the deal on Saturday.

Peterson had begun the final year of his rookie contract and was in position for a big pay day. After setting the NFL’s single-game rushing record with 296 yards against San Diego in 2007, Peterson has been picked for the Pro Bowl in each of his four seasons. He’s already second in Vikings history behind Robert Smith in yards rushing for his career.

The Vikings open the season against the Chargers on Sunday in their first meeting since Peterson’s 296-yard game.

Owner Zygi Wilf says the franchise is “proud to have him be a part of the family for years to come.”