SAN DIEGO -- As a member of the Oakland Raiders' practice squad and part of the defensive scout team, Korey Toomer knew quarterback Derek Carr was of course off limits in practice.

But on Sunday, Toomer will get a chance to hit his former teammate as a member of his new team, the San Diego Chargers.

“I really look forward to playing against them,” Toomer said. “Just being around those guys and knowing how they are, I’m looking forward to finally being able to hit Carr. I couldn’t hit him in practice, now I can. Now it’s live.”

Toomer said he holds no grudge against his former team.

“I’m trying to help this team win, so wherever I can help, I will,” Toomer said. “I was there for a year and a half, so I know a lot about the team. And I’m just trying to help my team win.

“I look at it as it’s a business. I couldn’t do anything about that. That’s something I can’t control, and I can’t worry about stuff like that. Just wherever I go next, I’ve got to fit in. I like playing in the Black Hole, it gets you pumped up.”

Korey Toomer spent the first three weeks of this season on the Raiders' practice squad. Mark J. Rebilas/USA Today Sports

The Chargers are thin at inside linebacker heading into Sunday’s matchup. Defensive playcaller Manti Te'o is done for the year after sustaining a torn Achilles tendon two weeks ago against the Indianapolis Colts.

Backup linebacker Nick Dzubnar has been ruled out due to a knee injury, and starter Denzel Perryman is questionable with a shoulder issue.

So, along with playing special teams, Toomer could see significant time on defense for the Chargers.

“He’s athletic and smart,” Chargers defensive coordinator John Pagano said. “He picked up a lot since last week. We’re giving him a crash course in everything, and we have to. He’s somebody who keeps learning and keeps getting better each week.

“But the athletic ability really shows with him and how he can run.”

Toomer, 27, was a fifth-round selection by the Seattle Seahawks in the 2012 draft. He spent time mostly on Seattle’s practice squad in his two seasons there before joining the Dallas Cowboys in 2014, where he played in one game.

Waived midseason by the Cowboys, Toomer was signed by the Los Angeles Rams, appearing in seven games in 2014.

He went to training camp with the Rams in 2015 but was released during final roster cuts.

Toomer signed with the Raiders last season, joining former Seattle linebackers coach Ken Norton Jr., who serves as the team’s defensive coordinator.

Toomer appeared in 10 games for the Raiders in 2015, finishing with four tackles. He went to training camp with Oakland this year but was released during final roster cuts.

Toomer was added to Oakland’s practice squad this year, where he spent the first three weeks of the 2016 season before San Diego signed the Idaho product to the team’s active roster two weeks ago.

Toomer’s strength is his athleticism. At 6-foot-2 and 235 pounds, Toomer ran a 4.53-second 40-yard time at his pro day and posted a 42-inch vertical jump.

Toomer played outside linebacker in Oakland’s 4-3 scheme but will be asked to play inside linebacker for the Chargers.

“These coaches aren’t asking me to do anything that I don’t already do,” said Toomer, when asked about making the transition from a 4-3 to a 3-4 scheme. “I’m very athletic, and I just need to play fast and fly around. I’m just trying to get used to the terminology here, which is probably the only difference.”