Robert Quinn, Trumaine Johnson doubtful to play vs. Arizona

EARTH CITY, Mo. -- Earlier this week, St. Louis Rams coach Jeff Fisher expressed optimism that his team would get some key contributors back from injury this week.

As it stands on Friday, it looks like there will be just one. On the team's Friday injury report, the Rams listed end Robert Quinn (back), cornerback Trumaine Johnson (thigh) and kicker Greg Zuerlein (groin) as doubtful. That means the chances are that none of them will play against the Arizona Cardinals on Sunday.

If that's the case, the Rams will again turn to Eugene Sims (end), Marcus Roberson (corner) and Zach Hocker (kicker) to step into the starting lineup.

On the bright side, it appears right tackle Rob Havenstein will be back from the calf injury that's had him on the sideline for three of the past four weeks. Havenstein was a full participant all week and is listed as probable for Sunday.

Meanwhile, quarterback Case Keenum is still working to pass the concussion protocol and was again limited in Friday's practice. Nick Foles will start against Arizona, but the question on Keenum remains whether he'll be No. 2 or inactive. To even have a chance to be Foles' backup, though, Keenum will need to pass the concussion protocol.

Here's the full Friday injury report:

Out -- OL Andrew Donnal (knee).

Doubtful --DE Robert Quinn (back), CB Trumaine Johnson (thigh) and K Greg Zuerlein (groin).

Questionable -- QB Case Keenum (concussion).

Probable -- OT Rob Havenstein (calf).