League One side Crawley Town have withdrawn the new contracts offered to Dannie Bulman, Mike Jones, Jamie Proctor and Mat Sadler.
The quartet were offered new deals last month, with a deadline of the end of May to agree to remain with the Reds.
"The door is still open if any of the lads want to come back and talk to me but the ball is in the club's court now," boss John Gregory said.
"We are working on other targets at the moment to strengthen the squad."
He added: "We're disappointed but that's football."