A day after paring it down to 53 players, the Raiders are continuing to shape their roster, announcing they signed free agent defensive back Phillip Adams, linebacker Keenan Clayton and offensive tackle Willie Smith. To clear spots for those players on the active roster, the Raiders waived cornerbacks Chimdi Chekwa and Bryan McCann and waived/injured defensive tackle Jamie Cumbie.
Adams has played in 22 career games for the 49ers, Patriots and Seahawks since the 49ers drafted him in the seventh round of the 2010 draft. Clayton was drafted by the Eagles in the fourth round in 2010 and played in 21 games for Philadelphia. Smith, undrafted in 2011, played in four games including three starts for Washington last year.
Chekwa played in four games for the Raiders as a rookie last season, starting one, and started training camp as a second-team corner. McCann came into Thursday's preseason finale to return punts after Roscoe Parrish, who was cut Friday, fumbled two punts, so the fact the Raiders found him expendable could mean Denarius Moore is close to returning -- or that the Raiders are just going in another direction on punt returns.