Source: Zack Bowman to have MRI

CHICAGO -- Chicago Bears cornerback Zack Bowman is scheduled to undergo an MRI early this week to determine the severity of a foot injury suffered late in the third quarter of a 23-20 loss to the Seattle Seahawks on Sunday, according to an NFL source.

Bowman appeared to hurt his foot while pushing Seattle wide receiver Deon Butler out of bounds after a 15-yard completion.

After starting 12 games last season, Bowman has been coming off the bench and rotating with Tim Jennings, who also re-injured a finger Sunday, at left cornerback the past three weeks.

"That's what I'm here for, just to help the team as much as I can," Jennings said after Sunday's game. "I've started the last three weeks, and me and Zack have been rotating. He's a great addition [to the defense], I'm a great addition, but now I think I'm going to get the bulk of the load. I just hope Zack can come back as fast and healthy as possible, but [it's] next man up. We just got to keep it going."

Meanwhile, safety Danieal Manning was forced to the sidelines late Sunday with a rib injury. Manning initially hurt his ribs while combining with Charles Tillman to make a tackle in the first half, but the safety played through the pain.

However, Manning felt his ribs tighten up after returning a fourth-quarter kickoff 89 yards for a touchdown that was taken off the board because of a holding penalty.

Manning tried to continue to play, but the pain proved too great, and veteran Josh Bullocks took over at one of the safety spots.

Jeff Dickerson covers the Bears for ESPNChicago.com and ESPN 1000.