Khalil Mack will play the Oakland Raiders this Sunday for the first time he was traded to the Chicago Bears.
Mack expected to sign a long-term contract with the Raiders and spend his entire career with the franchise.
"That's the expectation when you get drafted to a team: You want to be there for the long haul and bring championships and all those good things," Mack said. "It's the business side of it that doesn't really let you do that."
Mack was drafted fifth overall by the Raiders in 2014.
Mack signed a lucrative multiyear deal with the Bears that included $90 million in total guarantees.