NAC Breda have given Celtic permission to open talks with Rigters and the 23-year-old looks to be heading to Parkhead.
No Money From Toon For Dutch Striker
Breda director of football Earnie Stewart: "Celtic have faxed us a note of interest and are the only club so far to do that.
"We are in the process of negotiating a new improved contract with him. But, if he wants to speak to Celtic, then there is nothing we can do about it because it's all been done by the book."
Rigters hit four goals for Holland en-route to the side winning the European U21 Championship final and is seen as hot property, as coverage of the competition has raised his profile. But it is interesting how none of the Dutch big three - Ajax, PSV or Feyenoord - have made a move.