Clayton, who signed a five-year contract worth as much as $26 million last year, was guaranteed $3 million in base salary this season.
After Thursday's final preseason game, Bucs coach Raheem Morris said: "We got a chance to evaluate some of Reggie [Brown] and we were able to evaluate some of Arrelious Benn. "Really, we got a chance to look at those guys. We've already seen a lot of Michael Clayton, and we're going to get a chance to see a little bit of Michael Clayton next week as well. All those guys, we're going to find out who's going to play Z for us, who's going to be our starter.''
Clayton had 16 catches for 230 yards and a touchdown last season for the Bucs.
Titans cut QB Simms, DE Brock, RB Gado
Chargers let go of WR Reed
Saints put S Sharper, LB Ingram on PUP list
Jaguars release WR Williamson
Lions trim CB Bly, T Jansen
Dolphins drop QB White
Raiders release QB Brennan
Bengals trim WR Jones, K Rayner
Vikings cut WR Walker, RB Johnson
Javon Walker was cut by Minnesota Vikings on Saturday, after bringing in the former Green Bay Packers receiver two weeks ago to team with former teammate Brett Favre. The Vikings also cut former Boise State standout Ian Johnson.