That will certainly be the case in London on Sunday, when Mack will face the Raiders, his former team that wouldn't pay him a record contract and instead traded him to the Bears days ahead of the 2018 regular season.
So it comes as little surprise that Mack isn't saying anything about revenge against the Raiders.
"There are feelings you suppress," Mack said. "But also, it’s no big deal to me, man. I’m here. I love the Bears. I’m going to go out and try to get this win.
"You could say I’m suppressing the emotional side of it. But the other side is to go out and make them pay for it."
The Bears traded their 2019 and 2020 first-round picks to the Raiders as part of a blockbuster deal that brought Mack to Chicago. They also acquired a 2020 second-round pick in the package. Mack then signed a six-year, $141-million contract upon arrival in Chicago. It represents the largest contract ever awarded to a defensive player.
In 18 regular-season games with the Bears, Mack has recorded 17 sacks, 10 forced fumbles and a pick-six. Led by his play, Chicago led the NFL in scoring defense and takeaways in 2018.
"I'm sure it's in the back of his mind," linebacker Danny Trevathan said of Mack seeking revenge. "He doesn't really get too worked up about it. He just works like a pro, puts his head down. He loves the game of football, works hard every week. But, me personally, I know that I want to get it for him. I know guys on defense want to get it for him.
"I know that he's going to be ready to go. No doubt in my mind, he's going to be ready to go."
Bears cornerback Prince Amukamara first thought of Mack's revenge factor after Chicago's win at Washington on Sept. 23, when safety Ha Ha Clinton-Dix produced two interceptions, including a pick-six, against a Redskins team that didn't re-sign him in offseason.
Amukamara then thought of what Mack could do against the Raiders.
"It's just always sweeter to do it against your former team," Amukamara said then at FedEx Field. "I can't wait to go to London (to face the Raiders). Like, you think Mack is turning it on now? Wait 'til he gets to London. Mack's going to want to -- oh, gosh, I can't even imagine stuff like that."
Mack still maintains close relationships with many Raiders. He considers quarterback Derek Carr to be a "brother" -- but Mack also wants to sack his brother Sunday.
The Raiders refused to put the right price on Mack's play and chose instead to deal him away. That remains in the back of his mind.
"You could say I was disappointed, but that’s the nature of the business," Mack said. "You have to understand that, first and foremost, and let everything take care of itself. You only can control what you can control."