"He was over at the house, and we didn't talk about it one time," Carr said, per ESPN.com's Paul Gutierrez. "We played pool basketball and I dunked on him."
After being taken fifth overall in 2014, Mack is entering the final year of his rookie deal. He is scheduled to make $13.8 million in 2018, per Spotrac.
Mack has not participated in the team's offseason workouts. Even more concerning for the Raiders, ESPN's Adam Schefter reported last week that Mack and Jon Gruden had not talked since the coach was hired in January. Gruden has since denied that report, although he acknowledged the two have not talked in months.
It doesn't appear as though they will talk anytime soon, either. Ian Rapoport of NFL Network reported over the weekend there is "no optimism" regarding contract talks.
Mack, of course, is looking to get paid. In his first four seasons, he has been named to three Pro Bowls, earned two first-team All-Pro nods and was named the 2016 NFL Defensive Player of the Year.
Oakland took care of Carr last season with a five-year, $125 million extension. Now, he hopes Mack will be find his way back on the field soon—but he won't get involved in his teammate's business matters, telling Gutierrez:
"I think it's fair to say that we would all love to have Khalil here. If I tried to answer it politically correct and all those things, we all know that we want him back. I think everyone feels that in our whole building.
"I have been in contact with him. He's my brother. ... I'm fully confident with where Khalil is at and where our team is at. Obviously, we want him back, but again I try not to step into that."