The NFL’s leading rusher, 49ers RB Jordan Mason, is believed to have suffered a sprained AC joint during Thursday night’s win at Seattle that is not considered serious, but he will undergo further testing today, per sources.

Related Players: Isaac Guerendo, Patrick Taylor

This doesn't give us a good lean on how much time he could miss (if any), but there's a good chance Guerendo gets a shot at leading the rushing attack after he put the game away with a 70+ yard run. We'll keep an eye on the situation, but hopefully, Mason isn't forced to miss too much time.

San Francisco 49ers star running back Christian McCaffrey has bilateral Achilles tendinitis, meaning he has it in both legs, per NBC Sports. McCaffrey recently went to Germany for treatment.

The 49ers said they expected to get a "better idea" on McCaffrey's status over the next few weeks. The team's plan was to ramp up his rehabilitation to "see how it responds." General manager John Lynch added that the team is aiming to "quiet down" the injury.

Related players: Jordan Mason, Isaac Guerendo, Patrick Taylor

The story said Achilles tendinitis is described as "an overuse injury of the Achilles tendon, the band of tissue that connects calf muscles at the back of the lower leg to your heel bone," according to the Mayo Clinic. Some Achilles tendinitis can be treated at home, while more serious cases can lead to tendon tears that may require surgery. The story went on to say, until McCaffrey, the team and the medical specialists see how the area responds to more work, it's hard to make a call on when he will be back, if he does come back this season. NFL Media reported Sunday that McCaffrey should be back, at least, by early November, but the report of bilateral Achilles tendinitis could change things. For now, Mason remains the bellcow. He had 24 carries in Week 4 with Deebo Samuel getting two. Guerendo had a fumble on special teams and had just one carry in the game.

And to top it off, 49ers RB Christian McCaffrey is seeing a specialist in Germany regarding his Achilles tendinitis.

Related players: Jordan Mason, Isaac Guerendo, Patrick Taylor

This doesn't sound good for CMC. Now owners can't help but wonder if McCaffrey will be back after missing his four games on IR. Mason has filled in well, gaining 5.2 yards per attempt with two touchdowns on the season. But at this point, with CMC seemingly a huge question mark, it may be time to pick up players like Guerendo and Taylor. Guerendo was the only other back to get carries in Week 3, running five times for 19 yards.

The 49ers are now considering placing Christian McCaffrey on injured reserve, which would sideline him this week plus three more games, Shanahan said.

Related Players: Jordan Mason, Isaac Guerendo, Patrick Taylor

While it's possible that the team brings in another back, they sure weren't opposed to giving Jordan Mason a phenomenal workload last Monday. As it stands, Mason is a must-rostered, must-start option for as long as McCaffrey is out.

The 49ers will have wide receiver Brandon Aiyuk and left tackle Trent Williams against the Jets on Monday night, but they will not have running back Christian McCaffrey.

Jordan Mason, Patrick Taylor and Isaac Guerendo are the available backs for the Niners.

Definitely a shocker and likely a big blow to fantasy owners. According to the story, McCaffrey said on Friday that he had no doubt he would play and there was plenty of optimism from head coach Kyle Shanahan and General Manager John Lynch as well. McCaffrey missed most of the summer with a calf injury and is listed with an Achilles issue as well, the story said. Mason had a great camp and seemed to get a lot of attention from coaches this summer, and likely should get a bulk of the workload tonight against the Jets. Hopefully CMC owners backed themselves up during drafts by nabbing Mason. If Mason is still on your wire, he's worth picking up for any team in case CMC's issues are longer term. Taylor and Guerendo could get work for the Niners as well - if you're in a pinch losing CMC. From the Jets side, Braelon Allen and Israel Abanikanda could see touches behind Breece Hall.

The Packers are set to play another game without running back Aaron Jones.

Jones was limited in practice all week because of the knee injury that has kept him out of the team’s last two games and he was listed as questionable on Saturday. Tom Pelissero of NFL Media reports that Jones is not expected to play against the Giants on Monday night, however.

Related players: A.J. Dillon, Patrick Taylor, Kenyan Drake

If Jones is out, it will be the sixth game he's missed due to injuries this season, the story pointed out. Dillon has served as the lead back in Jones’ absence from the lineup and would continue in that role with Taylor as the No. 2. The Packers could also elevate Drake from the practice squad for further backfield depth, the story went on to say.

Packers coach Matt LaFleur tells reporters that RB Aaron Jones (knee sprain) won't play again this week. He hasn't practiced since his injury.

Related Players: A.J. Dillon, Patrick Taylor

The recent increased usage for Dillon hasn't helped to improve his inefficiency on the ground, as he has rushed for 72 yards on 28 attempts (2.57) the last 1.5 games, despite playing behind an average-or-better offensive line. Regardless, Jones' absence makes him fantasy relevant as a solid RB3.

Packers running back Aaron Jones looks like he’s going to miss Thursday’s game in Detroit.

Jones hurt his knee in Sunday’s win over the Chargers and Adam Schefter of ESPN reports that he has been diagnosed with an MCL sprain. He is considered unlikely to play on Thanksgiving and will be week-to-week moving forward.

Related players: A.J. Dillon, Emanuel Wilson, Patrick Taylor, James Robinson

The story went on to say the Packers had Wilson go down with a shoulder injury shortly after Jones was injured and both players were listed as non-participants in practice on Monday. The Packers signed Taylor to the active roster to go with Dillon, and Robinson was added to the practice squad. The team will likely roll with Dillon as their main back in a tough matchup against the Lions

Just a week after getting him back on the field, it looks like the Green Bay Packers may once again be without their star running back. According to a report from NFL Media, Aaron Jones is unlikely to play on "Monday Night Football" against the Las Vegas Raiders.

Related players: A.J. Dillon, Emanuel Wilson, Patrick Taylor

Jones played a limited role in his return to action last week after missing two games. As the story said, Jones apparently emerged with the injury still bothering him. He was limited in practices throughout the past week. If Jones is out, Dillon is expected to take over the lead role, but he hasn't been great this season, carry 44 times for 118 yards.

Packers injury update: RB A.J. Dillon is being evaluated for a concussion.

Related players: Aaron Jones, Patrick Taylor

Jones and Dillon ran all over the Rams, which included three TDs in the win - two of which came from Dillon. We'll have to see Dillon's status going forward this week leading up to Week 16's games, which is Christmas Day at Miami. After being unplayable in lineups this season, Dillon has turned it on a bit over the last few weeks. However he may be risky to wait on for owners as most of Week 16's games are Saturday.