"We have doctors that are there all the time," Caldwell said Monday. "They certainly have taken a look at it."
Manning said he hurt the knee when Titans defensive end Kyle Vanden Bosch hit him late in the first half of Sunday's game. Vanden Bosch was called for roughing the passer, a penalty that helped Indianapolis (5-0) get out from its own 7-yard line as the team marched 93 yards for a touchdown to score with 17 seconds left in the half.
The Titans (0-5) were called twice for roughing the passer on that series, and Manning was asked afterward if he had enticed the officials to make those calls.
Manning denied it and said he actually had been hurt.
"The first one, I've had that hit before to the knee," Manning said. "I don't know if that validates it or not, but I've got to see the doctor after this and get treatment, if that makes it more valid, I guess. Obviously, when you plant that left leg, it's in a vulnerable position. I wear that brace for that reason alone, for protecting me there."
It's the same knee Manning needed two surgeries on last summer to remove infections. He has since acknowledged that missing all of training camp and the preseason led to a slower-than-usual start in 2008.
The pain didn't appear to inhibit Manning's performance at Tennessee. He returned in the second half, finished 36-of-44 passing for 309 yards with three touchdowns and one interception, and extended his streak of consecutive 300-yard games to five.
The NFL record, shared by Steve Young, Kurt Warner and Rich Gannon, is six.
Manning isn't available to reporters until Wednesday, and he picked the right week if he needs extra recovery time. The Colts have a bye this weekend and won't play again until Oct. 25 at St. Louis. They might be at full strength by then.
Copyright 2009 by The Associated Press