Jon Gruden targeted Paul Guenther as his defensive coordinator in his return to Oakland even before he got the Raiders job Fred Warner Jersey , believing his aggressive defensive scheme was just what the team needed to reverse years of bad play.

Guenther's task has been even harder than originally thought because he is still waiting to get Oakland's best defensive player in camp.

Star edge rusher Khalil Mack skipped the entire offseason program and now extended his holdout into training camp as he seeks a long-term contract commensurate with the skills of one of the NFL's top defensive players.

"I really can't worry about that right now," Guenther said Sunday after Oakland's first padded practice. "I'm just trying to coach the guys who are out here. Obviously when he gets here, if he gets here, he'll be an exciting piece to add."

There is no indication of when that time will come as Mack's camp and Raiders general manager Reggie McKenzie have been quiet about negotiations. Mack is entering the final season of his rookie contract that is set to pay him $13.8 million and Oakland would have the option of using the franchise tag next offseason if no long-term deal is reached.

Mack is one of several prominent holdouts this summer, joining players like Rams defensive tackle Aaron Donald, Seattle safety Earl Thomas. Pittsburgh running back Le'Veon Bell is also staying away from training camp but is not a holdout since he has not signed his franchise tender.

"He's working Walt Aikens Jersey ," fellow edge rusher Bruce Irvin said. "I talk to him every day. He misses it. You just know how it is. He's working his butt off and when he gets in here he'll be ready."

Mack has been one of the top defensive players in football since being drafted in the first round in 2014. He was a first-team All-Pro at both defensive end and linebacker in 2015 and won AP Defensive Player of the Year in 2016. He has 40 1/2 sacks in four seasons and leads the NFL in QB pressures with 185 1/2 since entering the league, according to SportRadar.

Free-agent acquisition Tank Carradine has taken over Mack's role at defensive end on the base defense but is not an accomplished pass rusher. The Raiders hoped to upgrade that rush by drafting defensive end Arden Key and tackles Maurice Hurst and P.J. Hall.

Key and Hurst have shown good bursts early in training camp as the Raiders prepare without Mack.

"We can't worry about who isn't here because when Khalil gets tired, when he goes out of the game, the guys who are here have to go into the game and play while he is tired," Irvin said. "He rarely gets tired, but when he does those guys have to be ready. We're focused on getting these young guys ready and that stuff will take care of itself."

Irvin is also taking on a bigger role in the pass rush after spending his first two seasons in Oakland as an outside linebacker who also rushed the passer.

Irvin dropped into coverage on almost one-third of pass plays last season Marcus Cannon Jersey , according to SportRadar. But Guenther plans to use him almost exclusively as a defensive end in his defense.

"I just think his best gift is going forward," Guenther said. "That's what he should be doing each and every down. Instead of playing linebacker and dropping into coverage, we have to utilize his and everybody else's talents the best we can."

NOTES: CB Gareon Conley has missed the past two days with a hip strain sustained on the first day of practice. ... RB Jalen Richard left practice with an undisclosed injury.

With Jaguars guard Andrew Norwell and, more recently, Cowboys guard Zack Martin cashing in, another established interior offensive lineman remains in line for a new deal of his own: Washington guard Brandon Scherff.

As explained by Kareem Copeland of the Washington Post Kentrell Brice Jersey , Scherff is the next guard to get paid big money. The only question is when.

Currently eligible for a second contract, Scherff will make $705,000 this year. His salary will spike to $12.5 million next year, the fifth-year option.

Washington presumably could get Scherff under contract more cheaply by doing it now, and it will undoubtedly get more expensive the longer the team waits. At some point, they could find themselves back in another year-to-year franchise-tag dance Bryan Witzmann Jersey , like the one that just ended with quarterback Kirk Cousins leaving as a free agent.

It could make the most sense to pay him after 2018, but for a top-10 pick who has thrived through three seasons, it seems at least a little unfair to keep him south of seven figures for his fourth NFL season.

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