Khalil Mack spent the first four years of his NFL career with the Oakland Raiders.

Now, he'll be taking them on as an opponent for the first time as the Chicago Bears head to the Bay to battle the Raiders next Sunday, and the linebacker is looking forward to the meeting.

“(It) is a game I've been looking forward to,” said Mack, according to Vic Tafur of The Athletic. “I can't lie. It's going to be a big one for me.”

Mack was traded from the Raiders to the Bears shortly before the start of the 2018 campaign, as Oakland was beginning a rebuild under a new regime led by Jon Gruden.

The Raiders received a couple of first-round draft picks in return, but even still, people questioned if the deal was worth it for Oakland.

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Mack went on to play in 14 games during his first season in Chicago, racking up 47 tackles, 12.5 sacks, an interception, six forced fumbles, a couple of fumble recoveries and a defensive touchdown en route to a Pro Bowl appearance and a First-Team All-Pro selection.

Through four games this year, Mack has already logged 12 tackles, 4.5 sacks and four forced fumbles.

The 28-year-old, who played his collegiate football at Buffalo, was originally selected by the Bears with the fifth overall pick of the 2014 NFL Draft.

By his second year in the league, Mack was a Pro Bowler and a First-Team All-Pro after totaling 77 tackles, 15 sacks and a pair of forced fumbles. He went on to make three Pro Bowls while notching First-Team All-Pro honors twice during his time in Oakland.