Phillips suffered a sprained MCL knee injury during last Sunday's 38-35 loss to Green Bay. Phillips was listed as doubtful for the game on Friday.
Phillips joins several other Giants who are out for Sunday night's crucial NFC East game against the Dallas Cowboys. Starting center David Baas (neck/intense headaches), linebacker Mark Herzlich (ankle), linebacker Spencer Paysinger (hamstring) and defensive end Osi Umenyiora (ankle/knee) are also out and did not make the trip to Dallas.
Rookie safety Tyler Sash is expected to see increased snaps with Phillips out. Phillips has started every game this season and is second on the team in tackles (67) and has two interceptions.
Ohm Youngmisuk covers the Giants for ESPNNewYork.com.