This suggests calling him up may not be sufficient to commit him to Wales. We'll need to get him on to seal it.

FIFA Eligibility Criteria. Article 5. Principle

With the exception of the conditions specified in article 8 below, any Player who has already participated in a match (either in full or in part) in an Official Competition of any category or any type of football for one Association may not play an international match for a representative team of another Association.