Alan Sheehan, Andy Robinson and Lubomir Michalik are set to leave the club this summer and several sides have shown an interest in signing them.
"There's been one or two enquires," said Grayson. "Sometimes it's a bit difficult for clubs taking players in the middle of June because they are paying players for nothing. It might be a case of seeing how things develop over the next few weeks. We've had a bit of interest in all of them really so we'll just wait and see what the right options are for the players and for us as well."