The Dolphins moved Johnson (knee) to injured reserve Saturday.
Johnson appeared in four games this season, totaling just three defensive snaps. Ethan Robinson will now be the lead reserve slot corner behind starter Rasul Douglas.
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Dolphins' Isaiah Johnson: Suffers torn ACL
Rotowire
Head coach Mike McDaniel told reporters Friday that Johnson tore his ACL in Thursday's practice, David Furones of the South Florida Sun Sentinel reports.
The 25-year-old appeared in four games prior to tearing his ACL, recording three total tackles across 58 total snaps (55 on special teams, three on special teams). With Johnson now sidelined, Ethan Robinson is expected to operate as the Dolphins' top reserve slot corner.
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Dolphins' Isaiah Johnson: Inactive for Week 16
Rotowire
Johnson (knee) is inactive for Sunday's game against the Bengals.
Johnson was working through a knee injury during Week 16 prep, and his injury is severe enough for him to be sidelined for Sunday's home tilt. He's worked mostly on special teams across four regular-season games, so his absence won't negatively impact the Dolphins' secondary all that much.