The Los Angeles Chargers have signed Sony Michel after he was released this week by the Miami Dolphins.

Michel played for the Los Angeles Rams last season where he rushed for 540 yards between Week 13 and Week 18.

Michel signed a one-year contract with the Dolphins this offseason but was the odd man out in a crowded backfield. The Dolphins have Chase Edmonds, Raheem Mostert, Salvon Ahmed and Myles Gaskin on their roster at running back, as well as fullback Alec Ingold.

The Baltimore Ravens are expected to sign Kenyan Drake, according to a source.

Drake, 28, was released by the Las Vegas Raiders last week.

The Ravens' running back room is banged up. J.K. Dobbins (knee) is uncertain for Week 1 and Gus Edwards (knee) will miss the first four weeks of the season after being placed on the PUP list.

Baltimore leaned on Mike Davis, Justice Hill and Tyler Badie in the preseason.

Derwin James and the Los Angeles Chargers have agreed to a four-year, $76.4 million contract extension.

The deal has an average annual value of $19.13 million and resets the safety market, making James the highest-paid safety in NFL history.

James agreed to the deal one day after Chargers coach Brandon Staley described the star safety as an "impact player" and the "heartbeat of our defense."

"When I see him, I'm like, 'That's a defensive back,' because he can play anywhere," Staley said Tuesday. "He can play either safety spot, he can play corner. ... He can rush the quarterback and make an impact as a blitzer, he can make an impact in man-to-man coverage, and then he can make an impact in zone defense, whether he's playing low or high -- and he's our signal-caller and the heartbeat of our defense."

The Tampa Bay Buccaneers have signed Carl Nassib to a one-year deal, according to a source.

The move comes after outside linebacker Cam Gill suffered a Lisfranc injury in Tampa Bay's preseason opener Saturday.

Nassib spent the last two seasons with the Las Vegas Raiders. Before that, he started 17 of 29 games in a two-year stint with the Buccaneers.

The New York Jets have agreed to a two-year, $22 million deal with offensive tackle Duane Brown, according to sources.

Brown visited the Jets last weekend. The pact comes in the wake of right tackle Mekhi Becton's likely season-ending knee injury.

Brown, who turns 37 on Aug. 30, has 203 career starts -- all at left tackle.

Justin Tucker signed a four-year extension with the Baltimore Ravens, the team announced Monday, with a source saying it's worth $24 million and continues to make Tucker the NFL's highest-paid kicker.

Tucker, the most accurate kicker in NFL history, will earn an average of $6 million per season, the source said, which is $1 million more per season than any other kicker. 

Diontae Johnson and the Pittsburgh Steelers reached a two-year extension that averages $18.355 million per year.

The deal, worth up to $39.5 million if he reaches incentives, includes $27 million guaranteed.

Johnson, 26, was the final remaining hold-in of the 2019 wide receiver draft class after Deebo Samuel and DK Metcalf got extensions earlier in training camp.

Johnson led the Steelers with 1,161 yards on 107 receptions last season and hauled in eight touchdowns.

The Arizona Cardinals and left tackle DJ Humphries have agreed to a three-year extension worth $66.8 million.

Humphries will receive $34 million in guaranteed money and $21 million in Year 1.