The Oakland Raiders and Khalil Mack have not held contract talks since February.

Mack enters the final year of his rookie contract, with a fifth-year option salary of $13.846 million. 

Jon Gruden has seemingly gotten off on the wrong foot with his relationship with Mack.

The Minnesota Vikings and Stefon Diggs have agreed to a five-year extension worth $72 million. Diggs will receive $40 million in guarantees.

Diggs caught 64 passes for 849 yards and eight touchdowns in 2017. He has 200 receptions for 2,472 yards and 15 touchdowns in 40 career games.

"I love being here," Diggs said earlier this offseason. "... I love playing with the Vikings. I started here, and I've been happy all my time here. I love my teammates, I love my staff. There's no place I'd rather be than here."

Sam Darnold signed his rookie deal with the New York Jets on Monday.

Darnold was slotted to a four-year, $30.2 million deal.

The deal includes offset language, which the Jets wanted but that hadn't been part of the negotiations in recent weeks. The Jets agreed to change their position on default language regarding the guaranteed money, which had been a major sticking point. 

Darnold also becomes the first top-five pick to get his bonus at signing as a lump sum. 

The Atlanta Falcons have Jake Matthews have agreed to a five-year, $75 million contract extension.

Matthews was the sixth overall pick in the 2014 draft.

The Tennessee Titans have signed Taylor Lewan to a five-year contract extension that could be worth up to $80 million.

The offensive lineman's new deal carries $50 million in guarantees.

A first round pick in 2014, Lewan's contract was set to expire after the 2018 season.

A new contract agreement between the New England Patriots and Rob Gronkowski isn't close.

"Nothing is imminent," according to a source.

Gronkowski is due to make $8 million this year.

In an effort to help prolong his playing career, Ben Roethlisberger cut sugar and carbs from his diet this offseason.

Roethlisberger, 36, worked with a personal trainer this summer.

"Knees, ankles, being lighter -- those are all positives when it comes to this age and playing football, where you're pounding on your knees and you've had a couple of knee surgeries," he said. "Anything you can do to lighten the load on your knees is important."

Roethlisberger confirmed he has lost weight but wouldn't reveal the number.

While discussing the Dallas Cowboys' position on the national anthem, Stephen Jones said in a radio interview that players should stand "if they want to be a Dallas Cowboy."

Jones told KTCK 96.7 FM that the team supports the opinions of the players, but that those issues should be put aside while they are representing the Cowboys.

"We certainly are supportive of them when they have their personal issues or their personal things that they want to pursue," Jones said. "And we'll help them pursue them on Tuesdays. But when you're wearing the Dallas Cowboy uniform and a Dallas Cowboy helmet and you're working for the Dallas Cowboys, you check the 'I' and the 'me' at the door, and you're a part of a team."

Jones added that players would face punishment if they chose to stay in the locker room for the anthem.

Washington signed backup quarterback Colt McCoy to a one-year contract extension.

The one-year extension for 2019 is worth up to $7 million.

There are provisions in the deal that could still make McCoy a free agent after this season.

McCoy's base salary this season is $2.8 million and his cap hit is $3.6 million.

Julio Jones and the Atlanta Falcons have agreed to a contract adjustment.

The Falcons converted some of his base salary for 2019, approximately $2 million, into a bonus for 2018.

The Falcons can call this a cap neutral adjustment because the proration of the bonus negates the cap hit.

Jones will now report to camp.