Gregory said that there is good news on the injury front with Mike Jones fit, and that he wants Broadwood Stadium to become a fortress from now on.
"We have had a good week in training and we are working on a few things by doing a session at the ground today," he told the club's official website.
"Mike Jones is fit and there may be a change or two on Saturday - we will have to wait and see.
"It's a game we are looking forward to. Preston are going well and I managed Simon Grayson when he was a player and I always thought he had the makings of a good manager and that is proving to be the case - he has done a good job at Preston."
Crawley are currently 15th in League One.