Charlesworth put out a statement saying he would seek a new investor to buy the club so he could step away from the Mariners.
"After 10 years of involvement with the Mariners, I feel the time is right for me to now step aside and to look for a new investor to take on the ownership of the Club," Charlesworth said in the statement.
"With a host of young, talented players having broken into our first team and with a new independently run A-League around the corner, it's an exciting time for the club to grow and to now move forward under new ownership."
On Tuesday, Mariners CEO Shaun Mielekamp spoke to the media, rejecting reports that the asking price was $4 million.
"I want to smash that, that is a totally false figure and absolutely ridiculous, whoever wrote that, because there's no number [to sell the club] that has been put up," he said.
"An A-League licence is definitely worth more [than $4 million] and the conversations already have been more than that number so I see that as nothing but fake news."
Mielekamp said he was hopeful, but could not guarantee the club would remain on the Central Coast.
"I think it's very personally imperative that it [the future] is here, but of course in a situation where things are, there are no guarantees that the best offer for Mike may be looking a little bit different than the Central Coast," he said.
The chief executive said he was frustrated by Central Coast Council, which has not adopted Charlesworth's vision to own the stadium and develop the waterfront.
"It is frustrating because it was a very important part of the long-term strategy that Mike had seen for our club and a very exciting one as well," Mielekamp said.