The 21-year-old has been attracting a lot of attention with his impressive displays in Dutch second division and he looks set to leave his current employers for greener pastures.
Everything suggests Hahn will be leaving Dodrecht when his deal expires at the end of the current campaign, with a number of top sides showing interest.
Feyenoord are believed to be leading the chance for the talented shot-stopper, but it is thought that Celtic are keen as well.
Warner Hahn will be free to negotiate a Bosman deal with interested clubs from 1st January, and few more high-profile clubs are likely to join the race in the meantime.
Hahn, who had spent his youth career at Sparta Rotterdam and Ajax, has made a total of 35 league appearances for Dodrecht, while he is also a first choice for Netherlands Under-21.