Detroit Lions coach Jim Caldwell hinted Friday that wide receiver Calvin Johnson could miss Sunday’s game against the Buffalo Bills with a nagging ankle injury.

“That possibility always exists,” Caldwell said. “Just kind of depends on how one progresses during the course of the week. There are some times that they move forward enough that they won’t have any significant setbacks and other times you don’t feel that way. You have to wait until the end of the week and react accordingly.”

Caldwell was then asked if Johnson would be available against the Bills.

“We’ll see. We’ll see how it goes,” Caldwell said.

Johnson missed two games last season as he dealt with knee and finger injuries that required offseason surgeries.

Johnson missed practice Wednesday and Thursday but returned Friday, just as he did a week ago. He was limited against the New York Jets last Sunday, finishing with two catches for 12 yards.

Johnson said Wednesday he felt much better than he did at the same time last week.

“Things have gotten better all week,” Johnson said. “It was a struggle at first, and as the week progressed, it got better and better.”