John-Joe O’Toole (groin), Brendan Moloney (hamstring) and Shaun McWilliams (ankle) are all doubtful for the season opener at Shrewsbury on Saturday.
O’Toole underwent surgery at the end of last season and has suffered some discomfort in recent weeks.
“They are all improving but Saturday might just come too soon for them,” said boss Justin Edinburgh.
“It’s been a bit of a frustration with John-Joe because he was doing so well but we are mindful that we were ahead of where we wanted to be .
“In my head I’ve got the eleven that will start on Saturday but obviously there are decisions to be made. People will miss out but this is where competition starts and my job becomes difficult. That’s the way I want it to be.
“We are still trying to bring a goalkeeper in and hopefully that will happen before Saturday but it’s been a tough one. We haven’t been able to find the right player yet but we are working hard to do that. There are goalkeepers out there but we want to make the right signing for us.
“David Cornell has been excellent in pre-season and I would have no qualms at all about starting him against Shrewsbury and going forward but we do need competition in that area.”
Sam Hoskins, who suffered a cruciate knee ligament injury in January, is continuing to progress well but won’t be ready for the start of the new season.