Childs never played a snap in the NFL since missing his rookie season in 2012 because he ruptured patellar tendons in both his knees. Guion, 26, struggled with nagging injuries and finished with 21 tackles, a sack and a forced fumble in 13 games last year. He was due to count $4.3 million against the salary cap.
Childs is on the PUP list, so the Vikings will have to make a decision about activating him in a few weeks.
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