49ers RB Raheem Mostert (knee) out for season

And with RB Raheem Mostert announcing today that he is out for the season with a knee injury he sustained vs. Detroit, the 49ers now are signing former Lions’ RB Kerryon Johnson to their practice squad, per his agent

Related players: Elijah Mitchell Trey Sermon, JaMycal Hasty

Fantasy Impact: 

The news of Mostert now being out for the season is a huge blow to fantasy teams who took their shot he would be the team's RB1. After Mostert went out, it was Mitchell who carried 19 times for over 100 yards and a score. For now, he's the presumed starter as both he and Hasty beat out Sermon in camp, according to Kyle Shanahan. Sermon should still be owned and has draft capital in his favor, but he may not have much of a role in the short term. For now it looks like it's going to be Mitchell's job.

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