LAKE FOREST, Ill. -- Chicago Bears coach Marc Trestman ruled out Jay Cutler for Sunday's game against the St. Louis Rams, as the quarterback continues to recover from a high left ankle sprain.

Trestman said Cutler's time frame for recovery remains week to week.

Cutler left the locker room still wearing a hard cast on his left leg after Sunday's overtime win against the Baltimore Ravens, and on Monday, the quarterback had the cast taken off to get the ankle re-evaluated before another cast was put on.

"Jay would remain week to week," Trestman said. "I would rule Jay out for Sunday."

When Cutler originally sustained the injury Nov. 10, he expected to return by the team's Dec. 1 game at Minnesota, "but now, I don't know," the quarterback said Monday during "The Jay Cutler Show" on ESPN 1000. "We're taking the cast off periodically, just kind of checking to see where I'm at. We'll see again later this week, then early next week where it's at."

Cutler alluded to the injury possibly being more significant than what was originally diagnosed.

"There are a couple of ligaments that we're a little worried about that's different than the normal high ankle sprain," he said. "There are a few other things involved. If I just had a normal high ankle sprain, I wouldn't be in a cast. [A cast] helps it scar up and stuff, but the normal high ankle sprain isn't really a concern at this point."

Filling in for Cutler against the Ravens, backup quarterback Josh McCown improved to 2-0 as a starter, throwing for 216 yards and a touchdown with a passer rating of 92.9.