Veteran Charles Clay, dealing with a knee issue, was one of six players the Cardinals placed on the physically unable to perform list Saturday, Darren Urban of Azcardinals.com reports.
Also going on PUP: Defensive lineman Robert Nkemdiche (knee), offensive lineman Max Garcia (knee), linebacker Brooks Reed (hip), cornerback Brandon Williams (back) and linebacker Dante Booker (knee).
The PUP players are eligible to return at any point in camp but cannot participate in any on-field team work until they come off the list. Clay has been considered a potential starter, especially given his versatile skills and receiving abilities. He was signed after Buffalo released him in February. Reed was also a February signee after the Falcons cut him.
Nkemdiche and Garcia are each coming off ACL tears suffered last season.
The Cards report to camp July 24 and hold their first practice July 25.