Tennessee Titans WR Corey Davis (hamstring) and SS Johnathan Cyprien (hamstring) did not participate in practice Friday, Sept. 29, and have been ruled out for Week 4. DT Jurrell Casey (groin) was limited during practice and is listed as questionable. TE Delanie Walker (hamstring) and LB Erik Walden (groin) fully participated in practice and are not on the injury report.