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Jay Saunders says Tom Mills won't be allowed to leave Maidstone for nothing.
Mills, 25, remains on the transfer list almost a month after turning down a new contract.
There's been interest in the left-back who's on his way out of the Gallagher after 341 appearances in seven years, but United are yet to receive a formal offer.
Manager Saunders is planning further talks with Mills in a bid to resolve his future.
He said: "Dartford, Margate and Chelmsford have made enquiries.
"I spoke to Millsy briefly last week to see what was going on and I need to have another chat with him today.
"Hopefully something will happen before pre-season.
"We made him a very good offer and he decided not to take it.
"I had to make a decision. Joe Anderson had a lot of interest and I felt I couldn't keep hanging on.
"It's a case of agreeing something with a club but it won't be a free transfer, that definitely won't happen.
"There's been interest but it's also up to Millsy and whether they're clubs he wants to go to.
"It's a shame we weren't able to agree something with him but it happens."