On Monday, when he met with the media, Rams coach Steve Spagnuolo detailed the damage a day after the team's season opener.
Chamberlain, a reserve linebacker who is one of the team's top special teams players, received some bad news on his malady.
"He's got a pretty significant, they call it ‘Turf toe.' It's a little bit more than that, but it kind of goes in that category," Spagnuolo said. "It's going to be somewhere in the six-to-eight week deal. He's already seen a foot specialist, so that's what they're talking about right now, so we got a decision to make there."
Hoomanawanui, the late-round draft pick who was one of the biggest surprises of the preseason, may miss several weeks of action.
"Illinois Mike has a significant high ankle sprain," Spagnuolo said. "They've got to look at him a little bit more. I think there's some more tests for him to do to find out just exactly how bad that is. Keeping our fingers crossed on that one."
Spagnuolo said Dockery has a grade-one hamstring injury and may not be available to play this week against the Oakland Raiders on the road.
The Rams coach said a few other players would be day-to-day with lesser injuries.
"Steven Jackson's right knee was a little bit inflamed," Spagnuolo said, "but they took an MRI, he'll be day-to-day. I think he's alright. Justin King's got a low-grade hamstring, he'll be day-to-day. .... Laurent Robinson had an MRI done, it looked pretty normal, but he definitely irritated that ankle again, so he'll be day-to-day. Hopefully we can get him back during the week to practice. The other guys were kind of bumps and bruises."
Those additional issues included three starters — safety Oshiomogho Atogwe (groin), right guard Adam Goldberg (knee) and defensive tackle Fred Robbins (foot) — and rookie safety Darian Stewart (thigh), who was not active for Sunday's game.
Losing King and Dockery at cornerback during the game limited the Rams ability to cover Arizona's wide receivers in the second half because St. Louis also had rookie cornerback Jerome Murphy inactive.
Safety James Butler, who was returning from knee injury, was forced into significant action despite not being 100 percent going into the game.
RAMS MAKE ROSTER MOVES
Howard Balzer of GridironGateway.com is reporting that tackle Eric Young has been waived from injured reserve with an injury settlement, running back Allen Patrick was released from the practice squad and the Rams signed fullback Jamie McCoy to the practice squad to replace Patrick.
McCoy, an undrafted rookie out of Texas A&M, was with the Rams in training camp and played both tailback and fullback. He was one of the cuts the team made to get the training camp roster from 80 to 75.