The only chair of Celtic Studies in continental Europe, that I am aware of, was established in 1927 at Utrecht University in the Netherlands. Celtic studies are also taught at the University of Ottawa, as well as Glasgow and Edinburgh universities, and several other schools.

If often comes as a shock to modern day "Celts" to learn that the ancient Celts migrated westward from central Asia Minor (in what is now modern Turkey), and that they flourished for several centuries all across central Europe before reaching the British Isles.

Anyhow, once you have completed your present studies, you might consider applying for a Rhodes scholarship to study the Celts at a European university.