Rams without OT Rob Havenstein at Wednesday's practice

EARTH CITY, Mo. -- The St. Louis Rams finished last week's 27-6 win against the San Francisco 49ers with undrafted rookie Darrell Williams at right tackle in place of Rob Havenstein.

Rams coach Jeff Fisher said Havenstein had been dealing with an Achilles injury but played through it during the game before Williams stepped in for the final eight plays. Havenstein did not practice Wednesday with what the Rams called an ankle issue on the injury report.

"We have got it immobilized (in a boot) right now," Fisher said. "And he's doing much better, we're hoping to get him back on the field on Friday so we'll see."

The Rams were also again short on defensive ends in Wednesday's workout as Chris Long (knee), Robert Quinn (knee) and William Hayes (thigh) also did not practice. Running back Chase Reynolds also missed the practice with a thigh injury.

Here's the Rams' full Wednesday injury report:

Did not participate: DE Chris Long (knee), DE Robert Quinn (knee), DE William Hayes (thigh), RB Chase Reynolds (thigh), RT Rob Havenstein (ankle)

Limited participation: RB Tre Mason (ankle), S T.J. McDonald (foot)