"We still haven't gotten the result yet," Shanahan said. "I saw that the ACL was reported today. It would be a surprise if it's not. It happened yesterday. He's having the MRI right now, but it's a pretty unfortunate thing for him.
"We know what he went through last year with his back, and the guy's worked as hard as anyone on our team to get back.
"For him to get hurt before he actually got to go out there, just a freak thing on air, cutting. I really felt bad for the guy, but he'll be back next year."
Hurd went down on Sunday while working with a strength coach on a side field. He missed his rookie campaign last season with a back injury and was being eased back into practicing before this latest injury.
The 49ers drafted two wide receivers in April. Shanahan commented that the second, seventh-rounder Jauan Jennings, might be able to fill in for the loss of Hurd.
"Jalen is a little bit different in some aspects, but I think Jauan is a decent comparison," Shanahan said. "He is big, and he definitely has the mentality ... He's got the mindset, he's got the talent, he's got the tenacity to go out there and do it."
NFL Network also reported that the 49ers are bringing in veteran receiver Jaron Brown this week for a workout.
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