The Giants placed Adebo (knee) on injured reserve Friday, Dan Salomone of the team's official site reports.
Adebo suffered a significant knee injury during last Sunday's win over the Cowboys. The cornerback made three solo tackles on 10 defensive snaps before exiting the game. The 27-year-old will now need to miss at least four games before he is eligible to return from IR. The Giants signed cornerback Nikko Reed to the active roster from the Chargers' practice squad in a corresponding move.