The 17-goal forward's departure leaves a big gap to fill next season and he told the Northampton Chronicle & Echo: "I wasn't rushing to leave, I just couldn't sign within the deadline that the gaffer had.
"Although the contract was on the table for about a month I didn't start thinking about it until the season was done."
A host of clubs are likely to make a move for the powerful forward but he added: "After I finish my contract at wherever I land, though, who knows?
"Maybe one day I will come back."