The Oakland Raiders have not officially put Khalil Mack on the trade block, but many NFL teams will be interested in the former Defensive Player of the Year if he becomes available via trade.

According to CBS Sports' Jason La Canfora, the Buffalo Bills are one of the teams who have been tied to Mack the most since the defensive end's holdout began with the Raiders.

In a CBS Sports HQ video, La Canfora makes a point to mention the Bills first among teams that would interested in Mack. According to the CBS Sports NFL insider, Buffalo has done their 'due diligence' on Mack.

"The Buffalo Bills," says La Canfora, "the moment the Raiders were to say, 'Hey, you know, who's interested in Khalil Mack?' They would be all over that. And they've done their due diligence. The New York Jets, the Indianapolis Colts, Green Bay Packers, Chicago Bears. Those are the teams I'm continually hearing tied to Khalil Mack if/when he becomes available."

This isn't the first time the Bills have been linked to the former UB product during his holdout. A betting site listed Buffalo among the favorites to acquire Mack in a trade and a former sports agent listed the Bills as a potential landing spot.

In his career, Mack has established himself as one of the NFL's top defensive players. In four seasons, Mack has 304 total tackles, 40.5 sacks, 11 passes defensed, one interception and nine forced fumbles. He's been named to the Pro Bowl three times and is a two time first-team All-Pro. He also made history by being the first player to be named to the PFWA's All-NFL Team at two different positions.