The Bengals put their fourth defensive back on this year's season-ending injured reserve Tuesday with Marvin White, the second-year safety that tore his anterior cruciate ligament in his knee Sunday against the Ravens.
White, who had 10 starts, played in all 12 games this season and leads the secondary with 81 tackles with an interception and four passes defensed. That leaves the Bengals with 52 players on the active roster, one below the limit as they ponder adding a safety. If they don't, Kyries Hebert or John Busing could make his first NFL start Sunday in Indianapolis.
Also Tuesday they signed defensive end Ben Ishola to the practice squad. The 6-3, 255-pound Ishola is classified as a first-year NFL player. He opened this season with Indianapolis and played in four of the Colts five preseason games, with eight tackles, including one sack and two tackles-for-loss before being waived Aug. 30. He entered the NFL in the spring 2006 in Miami as a free agent out of Indiana and was waived at the conclusion of preseason. A native of Germany, he spent 2007 with the Colts as an International Practice Squad Player.