Mayfield is set to become a free agent after this season, Andrew Gross of Newsday reports.
This season will be the last of the five-year, $7.25 million contract that Mayfield signed under former GM Garth Snow. Mayfield is a solid third-pair defender who is probably due a raise in free agency. He would likely command between $3-4 million per season on the open market, which might be more than the Islanders are willing to pay a soon-to-be 31-year-old defender.