Camp infirmary

The 49ers returned for a new week of training camp Monday morning with enough players on their injury report to field an entire team. A whopping 39 names appeared on the list, including 19 players who didn't practice at all because of various ailments. The most notable of the five starters missing practice was quarterback Tim Rattay, who had targeted Monday as his return to action after missing the past five days but still is having problems with his throwing arm.

Coach Dennis Erickson said Rattay, who was rested last week after he developed swelling in his right forearm, attempted to throw Sunday during the team's first off day since camp began July 30.

"The pain is still there," Erickson said. "We're just going to wait until he's able to throw."

Erickson called Rattay's status "day by day," saying the arm injury is "something that will hopefully heal this week." Rattay also still is nursing a groin injury that required surgery in May. "His groin is in pretty good shape," Erickson said. "Once his arm is OK and he can throw, then it's a matter of we've got to start (testing) that groin, because he hasn't done anything on that."

Erickson was unclear on the status of some new injuries that surfaced after the team's exhibition practice late Saturday afternoon at Kezar Stadium in San Francisco.

Fullback Jasen Isom (right knee), linebacker Saleem Rasheed (right knee), tight end Marcus Helfman (right hip) and defensive tackle Riddick Parker (left knee) – who just signed with the team on Saturday – all underwent Magnetic Resonance Imaging exams after they were injured during the practice session that was part of the team's 49ers Fan Day festivities.

Rasheed, whose history of nagging leg injuries has thwarted his development since he joined the Niners as their third-round draft pick in 2002, is expected back by the end of this week. But Isom could miss up to three weeks. Helfman and Parker are between those two extremes.

First-round draft pick Rashaun Woods, who missed all of last week's practices with a right hamstring injury, was another player who didn't make it to his targeted return Monday. Woods is running on the side, however, and he could be back as soon as Tuesday.

"The thing you don't want to do with any of those guys is get them back out here too early," Erickson said, "and then they re-pull those things. You want to make sure it is healthy."

The Niners already have defensive end Brandon Whiting (left shoulder) on the physically unable to perform list. Defensive end Andrew Williams is out six weeks with a broken right leg, left tackle Jerome Davis is expected to miss about three weeks with MCL damage in his knee and rookie offensive lineman Khiawatha Downey is out up to four weeks with a similar knee injury.

Others not practicing Monday because of injuries were defensive tackle Anthony Adams (right ankle), receivers Arland Bruce (left hamstring), Adam Herzing (head and neck) and Kahlil Hill (left hip), center Jeremy Newberry (right patella), cornerback Ahmed Plummer (both groins), defensive linemen Bryant Young (groin) and Isaac Sopoaga (lower back) and kicker Kirk Yliniemi (right hamstring).

With so many significant players out of action, it's not just making it difficult for the Niners to make progress. It's making it difficult for them just to practice.

"It's hard," Erickson said. "It's disruptive, but that's just how it is. The positive thing is none of these injuries are season-ending. Some guys will be back in a couple or three weeks; lots of guys will be back probably by the end of the week. Those guys will be back. That's the good news."

The bad news? "Having them out disrupts practice, the timing of things," Erickson said. "When guys miss, they don't get any better. Let's face it. And we're a young team and we need to get better."

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