Christian McCaffrey has reset the running back market in the NFL.

McCaffrey agreed to a two-year, $38million extension with the San Francisco 49ers on Tuesday, making him the league's highest-paid running back.

The new deal keeps McCaffrey, who turns 28 on Friday, under contract for the next four years after he signed a four-year, $64million extension in 2020 following his third season with the Carolina Panthers.

The 49ers acquired McCaffrey from the Panthers via a trade during the 2022 season, and he won the AP Offensive Player of the Year award in his first full season in San Francisco in 2023 after leading the NFL in rushing with 1,459 yards with 14 touchdowns.

He added another 564 receiving yards and seven TD receptions to help the 49ers secure the top seed in the NFC.

In 27 games with the 49ers, he has 2,205 rushing yards and 20 touchdowns to go with 1,028 receiving yards and 11 receiving TDs.

Since his 2017 rookie season, he leads all players with 10,505 scrimmage yards, while his 81 scrimmage touchdowns trail only Derrick Henry's 88.

Known for his bruising running style, McCaffrey also leads all players with 72 runs of at least 10 yards over the last two seasons.

McCaffrey attended the first day of San Francisco's mandatory mini-camp on Tuesday after skipping voluntary work-outs over the last two weeks.