Tampa Bay running back Warrick Dunn (back) and guard Arron Sears (back/head) missed practice again on Friday.
Bucs head coach Jon Gruden suggested the team could be without both players, who are listed as questionable for the game vs. Kansas City.
"We'll make that decision when we get to Kansas City," Gruden said of playing Dunn and Sears. "They didn't practice today, and today is Friday, so we are concerned."
Dunn's injury and possible absence means the Bucs likely will activate running back Michael Bennett for Sunday's game. Bennett had an impressive preseason, but has been inactive for half of Tampa Bay's 2008 regular season games.
If Sears, who suffered the concussion during Wednesday's helmet-less practice, cannot go he will be replaced by rookie Jeremy Zuttah.
"He got knocked and suffered a concussion during Wednesday's practice," Gruden said of Sears. "He's feeling much better. He does have the back injury, which was somewhat of a problem, and now it's a combination of both. He feels better and we hope to have him for the game."
Tampa Bay safety Jermaine Phillips (arm) has been ruled out of Sunday's game. Several other players, including fullback B.J. Askew, wide receiver Michael Clayton (knee), quarterback Brian Griese (elbow), defensive tackle Jovan Haye (foot), wide receiver Ike Hilliard (shoulder) and wide receiver Maurice Stovall, are questionable for the game between the 5-3 Bucs and 1-6 Chiefs.
The Chiefs have their fair share of injuries as well. Punter Dustin Colquitt (right groin), linebacker Weston Dacus (groin), cornerback Patrick Surtain (quad) and running back Jamaal Charles (ankle) are questionable for the game. Safety Jarrad Page (groin) and cornerback Brandon Flowers (foot) are listed as probable. Running back Larry Johnson will not play vs. Tampa Bay due to off-the-field issues.