Myers played 15 games for the Bengals last season after signing as an unrestricted free agent from Denver.
Davis spent last year on Detroit's injured reserve list with a knee injury but played in all four Lions preseason games this year. Harris was claimed from New Orleans, where he played in all four preseason games, leading the Saints with 20 tackles.
Santucci has been out since Aug. 11, when he suffered a high ankle sprain against Green Bay.
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