The Arizona Cardinals have placed six players on the physically unable to perform list, including tight end Charles Clay, defensive lineman Robert Nkemdiche, offensive lineman Max Garcia, linebacker Brooks Reed, cornerback Brandon Williams, and linebacker Dante Booker.

Per NBC Sports' Pro Football Talk, the players are eligible to come off the list at any time. Both Nkemdiche and Garcia are rehabilitating from torn ACLs suffered last season.

Clay is a 30-year-old tight end dealing with a knee injury. He last played for the Buffalo Bills before signing a deal with Arizona in February. Before his four years with the Bills, Clay, a former sixth-round pick out of Tulsa, spent four years with the Miami Dolphins.

Nkemdiche, at 6-foot-4, is a fourth-year defensive tackle selected in the first round of the 2016 draft by the Cardinals. The 24-year-old spent three collegiate seasons at Ole Miss and recorded 4.5 sacks for the Cards last season.

Garcia is a 27-year-old Super Bowl champ who signed with Arizona in the offseason. He spent his first four seasons in the NFL with the Denver Broncos after the offensive guard was drafted out of Florida in the fourth round by Denver.

Brooks Reed is a 32-year-old linebacker coming off two four-year tenures with the Houston Texans and Atlanta Falcons. Reed signed a contract in the offseason with the Cardinals after a 16-game 2018 regular-season featuring 24 total tackles and four QB hits.

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Williams is a 26-year-old cornerback out of Texas A&M selected by Arizona in the third round of the 2016 draft. Entering his fourth season in the league and with the Cards, Williams played in every game last season.

Booker is an Ohio State product and linebacker who went undrafted and signed with Arizona.