"He's trending in the right direction," Caldwell said at his final pre-Super Bowl news conference.
Freeney has been receiving treatment several times daily since arriving in South Florida last week, trying to speed up the recovery after tearing a ligament in his right ankle during the Colts' AFC championship game victory over the New York Jets.
Earlier this week, Freeney said he believes he's improving. However, he still hasn't practiced with the team.
"He's getting better, but we'll see," Caldwell said. "It's still a day-to-day situation."
Freeney isn't the only injury concern for the Colts.
Offensive lineman Ryan Lilja has been bothered by a sore back and couldn't practice Thursday, but Caldwell said the team expects one of Peyton Manning's top blockers to be ready for the game.
It's still wait-and-see on cornerback Jerraud Powers and his ailing left foot.
Caldwell revealed Friday that Powers had "an internal fixation of a fractured foot," which typically means a plate or screws were inserted to hold a fracture in place.
Still, Caldwell sounded upbeat.
"He feels that he's going to be able to play," he said. "It's just kind of up to the doctors … if he's able to run and run without any inhibitions whatsoever. He's moving along and moving well and we'll see."