ESPN says off contract in June, from January 1st Wilshere is able to speak with foreign clubs when he enters the final six months of his deal.
Marseille are the latest team to express a desire to sign him.
Wilshere has rediscovered his best form and avoided any injury setbacks this season.
Many clubs are said to be monitoring his situation, including West Ham.
But Ligue 1 giants Marseille hope to open talks next month over a potential move to the Stade Velodrome.