49ers say WR Brandon Aiyuk (hamstring) week-to-week

The San Francisco 49ers were without defensive end Nick Bosa and rookie receiver Brandon Aiyuk for Tuesday's practice, something that is expected to be the norm for the foreseeable future.

Niners coach Kyle Shanahan said Tuesday afternoon that Bosa and Aiyuk will be "week-to-week" as Bosa deals with a muscle strain in his leg and Aiyuk recovers from what Shanahan called a "mild" strain of his left hamstring.

Fantasy Impact: 

Aiyuk's injury was a bit more obvious as he suffered the hamstring strain while tracking a deep pass from quarterback Jimmy Garoppolo late in Sunday's practice. Aiyuk pulled up before getting to the ball and immediately grabbed for the back of his left leg. Shanahan said the fact that Aiyuk's hamstring strain is considered mild was positive because the team initially feared it might be worse.

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