Moreau was elevated from the Giants' practice squad ahead of Monday night's game against the Cowboys, Dan Salomone of the team's official site reports.
Moreau was also activated from the practice squad in Week 2 against the Panthers, as he recorded two tackles while playing 14 of his 23 total snaps on defense. The 28-year-old figures to see similar usage with cornerbacks Aaron Robinson (appendix), Justin Layne (concussion) and Nick McCloud (hamstring) all sidelined Monday.