Bentley expressed his desire to keep the player in question, and further senior squad members could be heading for the exit door before the start of next season.
"Unfortunately one of the lads I'm desperate to keep, and he's desperate to stay, won't be staying," he told the Morecambe Visitor.
"His contract will probably be terminated so he's got a chance to get another club and do a bit of work and cut down on his travel.
"It's a massive blow for us. I've got a lot of time for the lad and he's been a good signing for us and he was keen to stay as well.
"But it's all part of the cutbacks we've got to make because we can't afford to keep him. We now need to look and identify a replacement for him."