"We're hoping they'll all be available Week 1 to start the season," Shanahan said.
LB Malcolm Smith suffered a hamstring injury and is unlikely to play against the Houston Texans on August 18. He is week-to-week.
"I think [Smith will] have a chance after this week," Shanahan said.
TE George Kittle and RB Matt Breida suffered separated shoulders but should be ready for the Week 1 game against the Vikings.
DE Solomon Thomas and T Garry Gilliam are in the concussion protocol.
"We'll see how that plays out here over the next few days," Shanahan said.
Shanahan also provided updates on the players who were injured entering the 49ers' first preseason game.
DE Arik Armstead will not practice during the week leading up to the 49ers' game against the Texans.
DE Jeremiah Attaochu is day-to-day. "I would be surprised if we didn't (have him back at practice sometime this week)," Shanahan said.
G Jonathan Cooper started practicing this past week, and he will see his reps increase during the coming week.
LB Brock Coyle will also start to see his reps increase in practice. "He's continuing to get rehab," Shanahan said. "I think we should start to ease him in this Sunday in practice."
G JP Flynn and G Joshua Garnett could also return to practice on Sunday. Both will be eased in with the hope to have them participating in full practices by the 49ers' game in Houston. Shanahan said Garnett took some anti-inflammatory medicine to get the swelling in his knee down.
DB Marcell Harris has been practicing but was held out against the Cowboys to let him continue to get healthy. "We'll up his reps this week," Shanahan said.
Shanahan was not sure about WR Max McCaffrey. "He's day-to-day," Shanahan said. "The players have [Saturday] off, and then we'll see him on Sunday, whether he'll be able to practice or not."
WR Trent Taylor is being eased back in. "He got some reps last week," Shanahan said. "He'll get some more this week, so he falls in the same boat as Cooper and all those guys."
LB Fred Warner is still day-to-day. "We're letting his chest heal so we'll see how he looks on Sunday, whether he can be in pads or not," Shanahan said.
The same thing for TE Cole Wick. He is close to practicing.
Shanahan does not expect to have CB K'Waun Williams back practicing this week, which means he will be unlikely to play against the Texans.
"I have a feeling he's going to try to go but I'd be very surprised if he played this week," Shanahan said. "We plan on holding him out."