Top Stories The Arizona Cardinals, with the beginning of training camp just days away, have placed a quartet of players on the Physically Unable to Perform list.The four players who will begin camp on the sideline are safety Tyrann Mathieu, cornerback Justin Bethel, defensive tackle Frostee Rucker and linebacker Zack Wagenmann.None of this comes as a surprise.Mathieu is still recovering from a torn ACL suffered in Week 15 of last season. By all accounts his rehab is ahead of schedule, but the Cardinals have no plans to rush him back. Comments Share The 5: Takeaways from the Coyotes’ introduction of Alex Meruelo Former Cardinals kicker Phil Dawson retires Grace expects Greinke trade to have emotional impact Derrick Hall satisfied with D-backs’ buying and selling Bethel underwent surgery to repair a fractured foot in April. The operation kept him out of the team’s OTAs as well as mini-camp.Rucker had an operation done on his ankle early in the offseason, and though his recovery is going smoothly he was not expected to be 100 percent ready by the start of training camp.As for Wagenmann, the second-year pro suffered a foot injury during a mini-camp practice. It was a tough blow for a player who missed all of last season after breaking a foot during training camp. It was his second broken foot in as many seasons.Each of the four players who are on the PUP list could return to practice at any time once they are cleared to play.The Cardinals will report to training camp at University of Phoenix Stadium Thursday for their annual run test, with their first practice being scheduled for Friday afternoon.