Linebacker Brian Urlacher returned to training camp Saturday after missing time for what the team called personal reasons, but he did not take part in the afternoon practice session.
"That's another reason why we had to bring in a couple of guys," Bears coach Lovie Smith said. "As you look down the football field today, we had five linebackers out of uniform. It's hard to practice that way. We're banged up at the linebacker position a little bit. We've had to bring in a couple of other players. (We) also brought in another defensive lineman."
A fifth-year veteran, Adibi has played in 38 games (eight starts) for the Houston Texans (2008-10) and Minnesota Vikings (2011), posting 55 tackles and forcing two fumbles. A fourth-round pick in 2008 out of Virginia Tech, Adibi also has recovered a fumble, in addition to making 13 tackles on special teams.
Asiodu has played in 11 games the past two seasons while tallying nine tackles on special teams with the St. Louis Rams and New Orleans Saints. Asiodu also spent part of the 2011 preseason with the Green Bay Packers, but the club released him before the regular season.
Whiteside came into the NFL as an undrafted free agent with the Dallas Cowboys out of Abilene Christian University.