“We have a lot of confidence in Jahmyr Gibbs,” Campbell said, via the team’s website. “He’s continued to get better and better as the season has gone. Given the opportunity, he’s made a lot of plays. He made some big plays for us. He brings an explosive element. He’s getting better in the pass game, and you see what he’s able to do in the run game. We have a ton of confidence.”

Craig Reynolds and fourth-round pick Sione Vaki are also on the Lions roster, but it’s going be Gibbs’s show the rest of the way and the Lions will need him to keep performing at the same level.

Related players: Craig Reynolds, Sione Vaki

Gibbs owners look like they could greatly benefit by the injury to Montgomery as we head down the stretch of the fantasy playoffs. We detailed a little bit on Monday that last season, when either Montgomery or Gibbs were out of the lineup, Reynolds got between 7-14 carries in three of those four games (the fourth was a blowout loss to the Ravens). It still remains to be seen just how the team will divide up the carries, but it's reasonable to think Gibbs should at least see a slight uptick in work with Montgomery out.

Lions RB David Montgomery is now out indefinitely after suffering an MCL injury during Sunday’s loss to the Bills, sources tell ESPN.

Related players: Jahmyr Gibbs, Craig Reynolds, Sione Vaki

Montgomery is undergoing additional testing on his knee and getting a second opinion to confirm, but he could be lost for the season, according to the rest of Schefter's post. It's another huge loss for the Lions in terms of their quest for a Super Bowl, but from a fantasy angle it looks like Gibbs will take over the as the clear RB1 going forward. Montgomery has scored 12 TDs this season and his fantasy owners now suffer a huge loss in their lineup for the rest of the fantasy playoffs. Reynolds will likely soak up some of Monty's between-the-tackles work at least, but it remains to be seen how the split in work will be determined. Last season in four games where either Montgomery or Gibbs were out, Reynolds had 7, 10 and 14 carries in three of those games. The exception was a blowout loss to the Ravens were he only received three carries. He had four receptions total in that four game span, so Reynolds could get a decent amount of touches each game for those who may be hurting at the position.

Source: Lions RB Jahmyr Gibbs suffered a hamstring injury at today’s practice.

Related players: David Montgomery, Craig Reynolds, Sione Vaki, Zonovan Knight

This will be worth monitoring until we find out just how serious this is. Hamstring injuries, of course, can be very tricky. If Gibbs has to miss any time or games to start the season, Montgomery would likely get a bulk of the work with Reynolds next up. The loss of the dynamic Gibbs would certainly change the Lions offensive attack. The rookie Vaki could get to see more time if Gibbs is out for a while.