Chris Miller has been placed on the Broncos' inactive list, days after Coach Mike Shanahan recommended the 34-year-old quarterback retire because of a history of concussions.

Team spokesman Jim Saccomano said yesterday Shanahan has decided Miller will not play the rest of the year.

The team also placed DTs Cyron Brown and Paul Grasmanis and WR Chris Doering on the inactive list for Monday night's game against the Jaguars.

Miller left for Eugene, Ore., Wednesday to ponder his future after meeting with Shanahan.

The quarterback was to return to the team yesterday, but the Broncos have not heard from him, Saccomano said.

"We presume he's still up in Oregon," Saccomano said.

Miller, who played nine seasons with the Falcons and Rams and went to the Pro Bowl in 1991, retired after the 1995 season following a series of concussions.

After a three-year layoff, he was given medical clearance to play again, and he signed with the Broncos last spring.

INJURED DOLPHIN: RB J.J. Johnson might miss today's game against the Jets because of a hamstring injury.

The rookie from Mississippi State was downgraded from probable to doubtful, leaving the Dolphins with just one healthy tailback as they try to end a two-game losing streak.

Johnson, who leads the team with 475 yards rushing, worked on a limited basis in Friday's practice for the first time this week. The 6-foot-1, 230-pounder has been slowed by nagging thumb, hamstring and calf injuries.

Team officials said Johnson's hamstring was sore yesterday.

"It's a concern, but I think he'll be fine," Coach Jimmy Johnson said Friday.

"At least for the long haul, he's going to be fine."