The 23-year-old has had a bright start to his season after being drafted fifth overall in the 2014 Draft out of the Buffalo Bulls.
Although he has struggled to record sacks, Carroll has revealed that he was blown away by Mack's talent after looking at his game on video.
He told reporters: "He jumps off the film. Every one of our coaches, when they break up and start looking at the Raiders and taking seriously what they're doing well, everybody comes back talking about him.
"He's almost unblockable and he's got a great motor. He's fast, he's tough, he's instinctive. We think he's an obvious factor."
The Seahawks hold a 4-3 record going into their clash against the Raiders on Sunday.