ALAMEDA, Calif. -- Khalil Mack prides himself on stopping the run.

While the No. 5 overall draft pick is known for his ability as a pass-rusher, Mack loves getting dirty and stopping the run. It kills him that the 0-2 Oakland Raiders have struggled with their run defense. The Raiders have allowed an NFL-high 400 yards on the ground in two games.

Backing up what coach Dennis Allen has said, Mack said halting the problems against the run has been a major emphasis this week as the Raiders prepare to play the New England Patriots on the road on Sunday.

“We have to get better, I have to get better,” Mack said. “It’s just a mentality. You have to dig and stop the run. Just have to get better at it. Once we fix that, everything will get better.”

In other Raiders’ notes:

Offensive coordinator Greg Olson is thrilled with the play of third-round pick Gabe Jackson at left guard. Jackson has been mauling defenders in the early season.

“I think he’s doing fantastic,” Olson said. “He’s got great practice habits, really works his craft and works his technique.”

The Raiders are working to get newly signed receiver Vincent Brown up to speed. He could be in the rotation as soon as this week. Brown was a surprise cut in San Diego this summer.

“We’ve only had a chance to see him two days, but he looks like he’s got some quickness at the line of scrimmage and obviously, he’s played and he’s been productive when he has played,” Olson said. “So we’ll continue to kind of get him up to speed as quickly as we can. I’ve seen some good things here in the last two days.”