Gregor (lower body) was activated from long-term injured reserve Saturday.
Gregor (lower body) practiced Tuesday and could return to the lineup against Montreal on Saturday, according to TSN 1200 Ottawa.
Head coach Travis Green said Wednesday that Gregor (lower body) skated at practice and is expected to return to game action in a week and a half, TSN 1200 Ottawa reports.
Gregor (lower body) was put on injured reserve Thursday, per the NHL media site.
Gregor logged an assist and two hits in Sunday's 4-2 loss to the Islanders.
Gregor (undisclosed) will be a game-time decision for Wednesday's matchup against San Jose, TSN 1200 Ottawa reports.
Gregor (undisclosed) isn't expected to play Monday versus Calgary, according to Tim Baines of the Ottawa Sun.
Gregor (undisclosed) will miss his fourth straight game Saturday versus Vancouver.
Gregor (undisclosed) has been ruled out for Thursday's game against the Golden Knights.
Gregor (undisclosed) will remain on the shelf versus the Oilers on Tuesday, Claire Hanna of TSN reports.