Cornerback Mylan Hicks, an undrafted free agent our of Michigan State was the first. In 2014, he had a career-high 19 tackles, four passes defended, and a sack in nine games for the Spartans. He has played cornerback, safety, and linebacker.
Hicks was one of the free agent cornerbacks invited to tryout for the team over the weekend.
Offensive lineman Renfrow was originally signed by the Arizona Cardinals as an undrafted free agent in 2014. He was waived just over three months later before spending time on the Green Bay Packers' and Seattle Seahawks' practice squads.
More San Francisco 49ers News
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Kyle Shanahan on benefits and challenges of short week ahead of 49ers-Rams showdown
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49ers practice and media schedule: Preparing for the Week 15 matchup vs. Rams
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"It's just stupid, and it's very immature": 49ers react to De'Vondre Campbell quitting on the team
San Francisco 49ers linebacker De'Vondre Campbell left Sunday's game against the Los Angeles Rams in the third quarter, heading to the locker room. Initially, many assumed it was due to an injury—despite him not playing. However, head coach Kyle Shanahan later revealed a...