Porter scored 22 goals for the Latics last season but is out of contract this summer and able to consider offers.

Oldham expected to receive a fee but a move to another country would enable Porter, 23, to move for nothing.

Managing director Simon Corney told the Oldham Chronicle: "We offered Chris a good contract and want him to stay."

Meanwhile Oldham and Chesterfield have held talks over a possible return to Oldham for midfielder Mark Allott, 29.

Oldham striker Matty Wolfenden, 19, has agreed a new two-year deal with the club.