"I'm going to think about it over the next couple of days," said Gregory, who is Super League's longest-serving coach. "I don't think I've ever been as low as I am now."
"It's always the coach that gets the blame. Once the players cross that white line there's nothing I can do. The spirit is very good but the players aren't performing to Super League standard."
Bradford Bulls were made to struggle for the two points at Hull. While a strong wind and heavy rain brought the sides together Hull almost pulled off an upset against the Challenge Cup semi-finalists. They led 3-0 through Steve Prescott's penalty and drop goal but Bradford edged ahead with Nathan McAvoy's try.
Hull, humiliated 58-6 by Wigan in their opening Super League game, did not give up and it took two penalties by old boy Steve McNamara to ensure the Bulls went home happy.
Huddersfield were denied a victory against Halifax when Dave Boughton's late touchdown was disallowed by referee Robert Connolly. That left Halifax, who had two tries of their own ruled out, running out 17-14 winners.
The London Broncos' New Zealand Test prop, Grant Young, has broken his leg in two places and will be out for the season. Young suffered the injury as London beat Sheffield Eagles 26-20 by virtue of a sterling fight-back at the Don Valley Stadium on Saturday. London now have no specialist props available for Saturday's Challenge Cup semi-final against Castleford.Reuse content