ALAMEDA, Calif. (AP) - The Oakland Raiders have signed free agent receiver De'Mornay Pierson-El.  

The Raiders waived receiver Saeed Blacknall on Thursday to make room for Pierson-El on the roster.  

Pierson-El most recently played for Salt Lake in the Alliance of American Football. Before joining the AAF, Pierson-El spent time with Washington after being signed as an undrafted free agent and also played briefly with Montreal in the CFL.

Pierson-El played four seasons in college at Nebraska with 100 receptions for 1,309 yards and 11 TDs in 43 games.