A league source told ESPN's Adam Schefter on Friday that Elijah Mitchell, a running back for the San Francisco 49ers, hurt his hamstring and is likely to miss all three of the team's preseason games.

The source told Schefter that Mitchell should be ready for the regular season, though. Mitchell did not take part in the team's practise on Wednesday,

and he was out of uniform before the first preseason game against the Green Bay Packers on Friday.

San Francisco's starting running back for the first two weeks of training camp, just like he did last year. Since Mitchell is out, the 49ers will use Trey Sermon,

Tyrion Davis-Price, a rookie, and JaMycal Hasty to run the ball in the exhibition games. Veteran back Jeff Wilson Jr. is also on the roster,

but he did not play against Green Bay. Neither did a lot of other important Niners, like left tackle Trent Williams, end Nick Bosa, linebacker Fred Warner,

receivers Deebo Samuel and Brandon Aiyuk, and tight end George Kittle.

Mitchell, who was picked in the sixth round of the 2021 draught out of Louisiana, set a franchise rookie rushing record with 963 yards

and five touchdowns last season, even though he missed six games due to injuries (ribs, knee, finger, shoulder, and concussion).

Mitchell came back to camp a little heavier after having knee surgery during the offseason. He hoped to be able to handle the workload without any trouble.

Mitchell is the second important Niner to be out with a muscle strain. Cornerback Charvarius Ward was out earlier this week with the same problem.

Ward is also expected to be ready for the start of the season, just like Mitchell.

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