Mason (shoulder) doesn't have an injury designation for Sunday's game against the Chiefs, Matt Barrows of The Athletic reports.

EDGE Analysis

Mason will return to his lead role in the San Francisco backfield after an AC joint sprain in his left shoulder kept him off the field for all but one snap during the second half of last Thursday's win at Seattle. He's been practicing all week, albeit in a a non-contact jersey. That does hint at some risk of complications in-game, but the upside generally outweighs the downside risk when dealing with a player that's provided such strong production. Meanwhile, fellow 49ers running back Christian McCaffrey (Achilles) has yet to resume practicing.

Mason (shoulder) is practicing in a non-contact jersey Friday, Nick Wagoner of ESPN.com reports.

EDGE Analysis

It's about the best fantasy managers could hope for, eight days after Mason suffered an AC joint sprain in his left shoulder during last Thursday's 36-24 win over the Seahawks. Isaac Guerendo and Patrick Taylor split playing time with Mason getting just one snap after halftime, and one of the possibilities for the upcoming game against Kansas City is Mason being active but taking fewer touches than usual. Mason was a limited practice participant Wednesday and Thursday and now appears likely to be listed as questionable on the final injury report.

Mason (shoulder) practiced in a limited capacity Thursday, Matt Maiocco of NBC Sports Bay Area reports.

EDGE Analysis

Mason continues to deal with the AC joint sprain that he suffered in his left shoulder last Thursday in Seattle. Per Nick Wagoner of ESPN.com, Mason has been wearing a blue non-contact jersey in practice this week, which resulted in a cap in his reps. Mason thus has only one more opportunity to get back to full participation Friday before the 49ers potentially hand him a designation for Sunday's matchup with the Chiefs. If Mason is at all inhibited or even sidelined this weekend, Isaac Guerendo would be the biggest beneficiary out of San Francisco's backfield, while Patrick Taylor likely would pick up a few touches along the way.

Coach Kyle Shanahan said Mason (shoulder) will be limited in practice Wednesday, Matt Barrows of The Athletic reports.

EDGE Analysis

Mason attempted to play through a left shoulder injury last Thursday at Seattle, but he departed after his lone carry of the second half and didn't return. Afterward, Shanahan confirmed that Mason had an AC joint sprain and deemed the running back day-to-day. At Monday's unofficial session, Mason was sporting a non-contact jersey, and his capped practice Wednesday likely indicates the same will come to pass. Isaac Guerendo will be the biggest beneficiary Sunday against the Chiefs if Mason cedes any of his typical workload to the rest of the 49ers backfield.

Mason (shoulder) sported a non-contact jersey during Monday's practice, Cam Inman of The San Jose Mercury News reports.

EDGE Analysis

Per Eric Branch of the San Francisco Chronicle, coach Kyle Shanahan relayed Friday that Mason suffered an AC joint sprain in his left shoulder during this past Thursday's win over the Seahawks, while noting at the time that the running back is considered day-to-day. Look for added context regarding Mason's status to arrive no later than Wednesday's injury report, but his presence at Monday's session suggests that he has a chance to be available Sunday against the Chiefs.

Coach Kyle Shanahan confirmed Friday that Mason suffered an AC joint sprain in his left shoulder during Thursday's 36-24 win at Seattle and is considered day-to-day, Eric Branch of the San Francisco Chronicle reports.

EDGE Analysis

Mason exited in the second quarter Thursday after landing on his left shoulder at the end of a carry and clearly favoring it as he went to the 49ers' sideline. While he was deemed questionable to return, he logged one play after halftime before departing the game for good. The 49ers never gave Mason a designation after that, and he was seen on the sideline wearing his helmet the rest of the second half, but Isaac Guerendo handled most of the RB reps for San Francisco down the stretch. The 49ers don't play again until Sunday, Oct. 20 against the Chiefs, so Mason will have extended time to try to get healthy ahead of that contest.

Mason is believed to have suffered a sprained AC joint in his left shoulder during Thursday's 36-24 win over the Seahawks but will undergo further testing Friday, Adam Schefter of ESPN reports.

EDGE Analysis

Mason exited Thursday's game in the second quarter, returned for one play after halftime, and then missed the rest of the game. Isaac Guerendo filled in as San Francisco's lead back and iced the game with a 76-yard run in the closing minutes, with Patrick Taylor also taking on some work (five carries, one catch) in Mason's absence. Meanwhile, the 49ers hope to get Christian McCaffrey (Achilles) back at some point within the next few games, although it's not clear if he has any chance to be ready for a Week 7 matchup with the Chiefs on Oct. 20.

Coach Kyle Shanahan didn't offer an update on Mason's (shoulder) status following Thursday's 36-24 win over Seattle, Grant Gordon of NFL.com reports.

EDGE Analysis

Mason suffered a shoulder injury on a run midway through the second quarter. He returned for one carry to begin the second half but then was forced back to the sideline due to the pain and did not reenter the contest. Shanahan didn't rule out a significant injury but said the team will have more information Friday.

Mason was able to return for only one play in the second half before being sidelined again with a left shoulder injury, Eric Branch of the San Francisco Chronicle reports.

EDGE Analysis

Mason was sidelined for a significant portion of the second quarter while having his shoulder evaluated. He returned for one carry to begin the second half but has since been sidelined for two 49ers' possessions. Mason doesn't have an official injury designation and has his helmet on while standing on the sideline, so it is possible he could return to the game again.

Mason (shoulder) returned to the field to begin the second half of Thursday's game against Seattle, Tom Pelissero of NFL Network reports.

EDGE Analysis

Mason was forced to the locker room midway through the second quarter with a shoulder injury. He didn't return to the field before halftime but logged the 49ers' first carry of the second half.