Bush is dealing with tightness in his calf, sfgate.com reports.

Bush's availability for Sunday's game against the Ravens is unclear as a result, and if he's forced to sit the contest out, Mike Davis is a candidate to rejoin the 49ers' backfield mix in Week 6.

Bush aggravated his calf injury in Sunday's game and is questionable to return.

The severity of Bush's injury is uncertain, but it could sideline him for the rest of Sunday's game against the Giants. His status will be updated when more details are released.

Bush (calf) caught 1-of-3 targets for six yards and carried once for no gain in Sunday's 17-3 loss to the Packers.

Bush returned from a two-game absence, but wasn't much of a factor. Meanwhile, starter Carlos Hyde didn't receive much work either, getting only eight carries, as the 49ers somewhat ignored him in a close game (they trailed by just four points at halftime). Assuming Bush didn't suffer any setbacks Sunday, he'll be available against the Giants in Week 5.

Bush (calf) is listed as active for Sunday's game against the Packers, the San Jose Mercury News reports.

Bush is thus on track to potentially make his mark as the 49ers' passing-down back in his return to action, though Carlos Hyde figures to remain the team's lead back in Week 4.

Bush (calf) is listed as probable for Sunday's game against the Packers, ESPN's Rob Demovsky reports.

With three consecutive full practices under his belt, Bush is poised to return for a favorable matchup. He doesn't figure to see much work outside of passing downs, but it isn't hard to imagine a scenario in which the 49ers fall behind and are forced to abandon the run. It's still only a favorable matchup in relative terms, as Carlos Hyde is the clear lead back in San Francisco.

Bush (calf) was a full participant at Thursday's practice, the San Jose Mercury News reports.

With consecutive full practices in the books, Bush is on track to return for Sunday's game against the Packers, likely serving as the passing-down back. Carlos Hyde is still the clear lead back, but Bush could be surprisingly busy if the 49ers fall behind.

Bush (calf) practiced fully Wednesday, the 49ers' official site reports.

Before practice commenced, the 49ers relayed that Bush would be a limited participant, but he was able to handle all available reps. If the activity level is sustained throughout the week, he should return Sunday versus the Packers, though his workload is to be determined as he comes off a two-game absence due to a strained calf.

Bush (calf) will practice on a limited basis Wednesday.

Bush will make his first appearance on the practice field since straining his calf against the Vikings in the regular season opener. Once healthy, he'll serve as a change-of-pace option to Carlos Hyde, but Bush's workload will likely be muted once he's able to suit up.

Bush (calf) has been downgraded to out for the 49ers' Week 3 matchup against the Cardinals on Sunday.

Bush was initially listed as doubtful, and considering his lack of practice time during the week, it's not a surprise he'll sit it out. In his absence, Carlos Hyde should take on an even larger role in the offense again, while Mike Davis and Jarryd Hayne should serve as the backup options.

Bush (calf) is doubtful for Sunday's game against the Cardinals, Matt Barrows of the Sacramento Bee reports.

Although he was optimistic earlier in the week, Bush never made it back to the practice field with his teammates. He did get in a bit of side work with the training staff, suggesting he could be back at practice next week. His likely absence leaves Carlos Hyde to handle more of the passing-down work, with Mike Davis serving as the top backup.

Bush (calf) did not practice Thursday, John Dickinson of 95.7 The Game reports.

Listed as a non-participant both Wednesday and Thursday, Bush appears truly questionable for Sunday's game in Arizona. His absence would leave more snaps for Carlos Hyde (leg contusion) and Mike Davis, both of whom logged full practices Thursday afternoon.

Head coach Jim Tomsula said Wednesday that Bush is "still working through it [the strained calf]" and is unsure whether the running back will be able to play Sunday at Arizona, Matt Maiocco of CSN Bay Area reports.

With practice commencing Wednesday, Bush is expected to work with the 49ers' training staff on the side, according to Cam Inman of the San Jose Mercury News. While Bush "feels good," it's unclear when his calf will be healthy enough to participate in on-field drills. Until that occurs, Carlos Hyde should handle the bulk of the running back reps, but he's dealing with a leg contusion himself.

Bush (calf) will not travel to Pittsburgh for Sunday's game against the Steelers, Joe Fann of the 49ers' official website reports.

The 49ers may ask Carlos Hyde to fill a three-down role, with Jarryd Hayne and Mike Davis serving as the backups. According to Fann, 49ers head coach Jim Tomsula said Bush will be back at 100 percent soon, even though the veteran running back has already been ruled out for Sunday's game. The conflicting messages leave Bush's Week 3 availability in question.

Bush (calf) didn't take the field at Thursday's practice, John Dickinson of 95.7 The Game reports.

Bush didn't take part in Wednesday's walkthrough, and his absence extended into the first official practice of the week Thursday. However, he didn't display an evident limp, while fitting in a workout in the weight room, so there seems to be a glimmer of hope that he'll play Sunday in Pittsburgh. As the week draws to a close, though, Friday's injury report should give an indication of his Week 2 availability.

The 49ers held only a walkthrough Wednesday, but Bush (calf) would not have taken the field had the team had an official practice, Matt Maiocco of CSN Bay Area reports.

Bush's status for Sunday's game against the 49ers remains uncertain, but he will likely have to get some time in on the practice field this week in order to play in Week 2.

Bush is considered week-to-week after straining his calf Monday versus the Vikings, Rand Getlin of NFL Network reports.

Although the injury isn't considered to be serious, Bush is seemingly in danger of sitting out Sunday at Pittsburgh. Perhaps Carlos Hyde's signature performance in Week 1 (25 carries for 168 yards and two touchdowns) gives the 49ers confidence in their ground game, but more than likely, the team will opt for caution when it comes to tabbing the inactive list this weekend. If he returns to practice at some point in the coming days, though, the tone surrounding Bush could very well receive an adjustment.

Bush's strained calf is not believed to be serious, but he may still miss Sunday's game against the Steelers, Matt Maiocco of CSN Bay Area reports.

Bush appeared to be in significant pain when he left Monday's game against the Vikings. If Bush isn't ready for Week 2, the 49ers will likely give his passing-down snaps to some combination of Carlos Hyde, Jarryd Hayne and Mike Davis.

Bush will not return to Monday night's game due to what's been termed a calf injury, Matt Maiocco of CSN Bay Area reports.

The brittle Bush can ill afford another injury, and he looked truly miserable while being carted off the field. Jarryd Hayne worked as the backup to Carlos Hyde following Bush's departure.

Bush departed Monday night's season opener with a leg injury and is considered questionable to return, ESPN's Paul Gutierrez reports.

Bush carried just twice before being hurt, gaining eight yards. He hasn't exactly been known for staying healthy throughout his career, so Bush's fantasy owners can't be surprised, but this happened particularly quickly.

Bush made his preseason debut Saturday against the Broncos, gaining 21 yards on his only carry of the night.

The 49ers finally unleashed the new weapon they acquired this offseason, and he demonstrated his playmaking ability on the only carry he received. It is interesting to note that Bush lined up as the team's primary punt return man Saturday. Many had assumed that rookie Jarryd Hayne had secured that position with his stellar performances in week one and two. That being said, Bush didn't do himself any favors when he misjudged a punt that ended up rolling and being downed deep in San Francisco territory. How this situation shakes out is important to Bush owners, because the boost in value he will receive in deep return yardage leagues could push him into flex territory.