Blues boss Paul Jewell is aiming to have a squad of 20 players at his disposal for the 2012/13 campaign.
Jewell told the club site: "We are looking to add to the squad and ideally I'd like 20 first-team players, especially as it looks as though we will be going back to seven subs next year.
"We want to be in a situation where we can have players who come into the side and don't weaken it too much.
"We were fortunate last year in that we didn't get any injuries to players like Cressy and Carlos Edward,s but injuries and suspensions happen and we have to be in a position to cover them.
"I have to be honest though, there isn't the money around to spend on the squad there was last year. That's not just here, it's right across football. What's happened at Rangers and at Portsmouth - and the recession that we are in - has put clubs on their guard."
Jewell, who has been promised some cash to spend by owner Marcus Evans and chief executive Simon Clegg, has previously said he’ll be looking to make around six signings during the close season.