San Francisco initially waived/injured O'Neal on Wednesday. The rookie safety reportedly said on social media that he had suffered a groin strain. O'Neal went unclaimed and reverted back to the 49ers' injured reserve list on Thursday.
On Wednesday, the 49ers signed cornerback Ken Crawley to a one-year deal, filling O'Neal's former roster spot. O'Neal initially signed with the team as an undrafted free agent on May 13.
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