Injury report & analysis: 49ers vs. Rams

The 49ers likely will be without the left half of their regular starting offensive line Sunday against St. Louis, while the Rams have lost their starting center for the season and have two defensive starters who are listed as questionable to play in San Francisco's home opener.


OUT: G Larry Allen (knee); TE Delanie Walker (shoulder)
DOUBTFUL: LB Parys Haralson (foot); OT Jonas Jennings (ankle)
PROBABLE: TE Vernon Davis (hip)


OUT: C Andy McCollum (knee)
QUESTIONABLE: LB Jamal Brooks (knee); DT Jimmy Kennedy (hand); LB Pisa Tinoisamoa (foot)

NOTE: Allen, Walker, Davis, Jennings, Brooks, Kennedy and Tinoisamoa each didn't practice with their respective teams Wednesday.

INJURY ANALYSIS: The loss of Allen for 2-4 weeks with MCL damage in his left knee is a blow to the 49ers strength along the offensive line, but Tony Wragge held up well in his place while playing virtually the entire game against Arizona and could get his first start since 2002, when he played for Arizona. David Baas also is in the mix to replace Allen for the short term and could see time at guard instead of Wragge. … Jennings didn't practice Wednesday but the 49ers still are holding open the possibility he could play against the Rams if he his ankle shows improvement later in the week. Adam Snyder would start in his place Sunday. If Jennings can get on the field, Snyder also becomes a possibility at guard in Allen's spot. … Nolan said that Jennings would have to participate in at least one full practice this week to play Sunday. He also said the 49ers could go with several different combinations involving Snyder, Wragge, Baas and tackle Patrick Estes to replace the Allen/Jennings left side. "I don't know right now who's going to end up starting on the left side of the line," Nolan said after Wednesday's afternoon practice. … Walker, who suffered a dislocated shoulder in the Sept. 1 preseason finale, could return to practice as soon as next week. … Haralson, who started doing individual work in practice last week, surprised some observers by participating in full drills Wednesday. But he saw limited time in 11-on-11 drills and likely will be on the inactive list again against the Rams before the 49ers attempt to work him back into their full-scale defensive plans. … Davis didn't practice Wednesday just to get an extra day of rest and likely will be in the starting lineup Sunday. Either way, Eric Johnson figures to get more work against the Rams. He only caught one pass for two yards against the Cardinals. … St. Louis is hurting at center where McCollum had been a constant, starting 97 consecutive games before tearing the ACL and MCL in his left knee Sunday against Denver. McCollum, who had played in every game since the 1995 season, was placed on injured reserve Tuesday and will miss the rest of the season. The Rams handled McCollum's absence by plugging in Larry Turner, who plays both guard and center. There are no other true centers on the roster, although guards Richie Incognito and Adam Goldberg have played there in the past. While the team is looking for a center with experience, Turner is expected to be the choice at this time. The Rams signed center Brett Romberg on Tuesday to replace McColllum on the roster. Romberg came into the league as an undrafted free agent in 2003 with Jacksonville and was released by the Jaguars in this year's final cutdown. Rams offensive line coach Paul Boudreau was with the Jaguars last season. … Kennedy had two pins placed in his hand Monday after fracturing the fourth metatarsal bone Sunday against Denver. Kennedy played with the injury for most of the game, and will be able to continue playing, although he will wear a cast for an estimated 4-6 weeks. He did not make any tackles against the Broncos. … Tinoisamoa starts at weak-side linebacker and is expected to be available against the 49ers. He had two tackles and recovered a fumble against the Broncos. If he is unable to go, 10th-year veteran Dexter Coakley would take his place in the lineup.

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