Arkadiusz Milik has agreed a permanent move to Eredivisie outfit Ajax.
The Polish striker arrived in Amsterdam on a season-long loan basis from Bayer Leverkusen back in May.
However, he has now agreed to extend his stay until the summer of 2019.
The 21-year-old, who has scored 23 goals this season, is currently sidelined for a month with a knee injury that he sustained on international duty.