Miller was cleared to resume practicing and did so Wednesday, only to be held out of Thursday's practice because of a setback in his recovery.
Arians told the newspaper that he hopes Miller won't miss more time.
"I sure have my fingers crossed. I hope so, but we're going to do what's in his best interests, his family's," Arians said. "We're not going to force anything. He's smart enough to make the right decision."
The Associated Press contributed to this report.