A former first-round pick, Darius spent nine seasons with Jacksonville before signing with Oakland as a free agent this summer. He was released by the Raiders on Sept. 2.
As for Thompson, he spent the last four years (2003-06) with Tennessee before being released on Sept. 1, 2007. Thompson also played in 13 games as a rookie for Cincinnati in 2002 after the Bengals selected him in the second round of that year's draft.
You may remember Thompson as the safety who intercepted an A.J. Feeley pass in the second half of the 2004 season opener at Dolphin Stadium.
Bell tore his left Achilles tendon in Sunday's game at Washington. Gbaja-Biamila, meanwhile, was one of the inactives for that game.