Pettis was signed to the Giants' active roster from the practice squad Tuesday, Michael Elsen of the team's official site reports.
The 25-year-old was a gameday elevation from the practice squad for Sunday's loss to the Rams, but he'll now join the active roster in a longer-term capacity after C.J. Board suffered a broken arm. Pettis caught five of 11 targets for 48 yards during his season debut and could continue seeing a similar role until one or more of Kenny Golladay (knee), Kadarius Toney (ankle) or Darius Slayton (hamstring) are able to return.