The Glasgow side face competition from Besiktas, who are also monitoring the French-born Moroccan.
The 27-year-old - who was part-time until leaving Bulgarian club Chernomorets Burgas two years ago - has been a revelation in Turkey this season. He has scored 14 goals in the campaign and has attracted interest from Olympique Marseille, although Celtic and Besiktas are understood to be his most determined suitors.
The Parkhead club have also been linked prominently with Richard Stearman, the Wolves defender but a free agent in the summer. He has also played for Leicester City and Ipswich Town.
The 26-year-old has missed just seven matches this season as his club earned promotion back to the Sky Bet Championship and is also a summer target for Leeds United and Bolton Wanderers.