The All-Pro defender made the comments on Wednesday when meeting with the media.
"I feel hella good," Peters said. "Coach wouldn't have let me go out there and play if I didn't feel good. What do you want me to say? I feel 100 percent? Yeah, I do. I feel 100 percent."
He has 15 tackles, two passes defensed and a 50-yard interception return for a touchdown in his five starts this season. Peters joined the Rams in March in a trade from the Kansas City Chiefs.
Fellow All-Pro Rams cornerback Aqib Talib is on injured reserve with an ankle injury. Pro Football Focus ranks Peters as its No. 106 cornerback out of 111 players at the position.
The Rams face the Broncos at 4:05 p.m. on Sunday at Mile High Stadium in Denver.