Jake Locker re-injured his left should during the Tennessee Titans' 38-14 loss to the Texans in Week 4.
Locker was sacked by Glover Quin and grimmaced in pain as he hit the turf and lost the football.
Locker will have an MRI on the shoulder on Monday.
“It is sore, we just don’t know to what level,” Munchak said. “We need to decide what happened. And then we’ll make a decision on what’s best for the player. We’ll evaluate that when we get more information tomorrow.”
Locker suffered a separated left shoulder in the season opener against the Patriots.