"We're just going to make sure he's fine," Mularkey said. "I don't think it's anything serious, but we'll check it out."
Losing Monroe would be the latest setback for an already-shuffled offensive line.
Guard Will Rackley missed the preseason opener because of a high-ankle sprain, is still wearing a walking boot and will be sidelined at least another week. Backup guard Jason Spitz is out at least a month with a foot injury, and reserve center is John Estes is likely out for the season with a knee injury.
"Got to be able to adapt, just got to be able to push forward with what you've got," guard Uche Nwaneri said. "It's not easy, but it's not supposed to be easy. ... We've got a lot of guys. We've got a good number of guys who have been here. We all understand the mentality. Overcoming the injury bug like that depends on how prepared your backups are."
Copyright 2012 by The Associated Press