Bailey (ankle) reached an injury settlement with the Chargers on Friday, Michael Gehlken of the San Diego Union-Tribune reports.
Bailey signed with the Chargers in early-August, but didn't see a minute of preseason action. The agreement removes him from the team's injured reserve list, leaving him free to sign with another team.
Square has been suspended four games by the NFL, the team's official site reports.
Square's suspension stems from a violation of the league's substance abuse policy. Early reports indicate that Square did not test positive for a specific substance, but the 27-year-old missed a scheduled test. Both Ryan Carrethers and Tenny Palepoi are likely to fill in during his absence.
Keo resigned with the Broncos on Tuesday, Mike Klis of 9News.com reports.
Keo rejoins the team just a few days after they parted ways. The safety was suspended for the first two weeks of the season but is now able to take the field again. He'll compete with rookies Justin Simmons and Will Parks for a backup safety position.