NFL Network's Ian Rapoport reported the news, noting Garrett sat out of Thursday's session.
The first overall pick of April's draft limped to the sideline toward the end of Wednesday's practice, but no formal diagnosis has been given.
“I mean, that’s part of the game,” Browns coach Hue Jackson said, per Chronicle-Telegram. “Obviously I don’t want to get any of our players nicked, hurt, any of that. We don’t want to lose any player, especially not one of our really good players. But hopefully things will be OK, and I think they will be. I don’t know that for sure, but we’ll find out.”
Mary Kay Cabot of Cleveland.com reported Garrett is still at team headquarters being evaluated. He'll "likely" undergo an MRI to determine the extent of the damage.
Garrett spent most of 2016 dealing with a left ankle injury, and it's unclear if the two injuries are any way related.
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The Browns wrapped up their minicamp session Thursday and will have a six-week break before their next mandatory team activities. Assuming Garrett's injury is nothing serious, he should be back and ready to go by then.