Greece has Northern Cyprus and Western Thrace, where in one district (of three) the Moslem minority (dominantly turkish) is actually a majority and in another it's 50-50 with the Greek population.

In Macedonia there is no significant area in which seperatist Macedonian Slavs are even a substantial minority, let alone a majority.

Note also that various areas in S. Albania have a Greek majority/significant minority (despite the fact that most of them left for Greece they retain citizenship and property there). Although the only people advocating seccession of "Northern Epirus" (as it is called in Greece) are a few ultranationalist wingnuts, given the new situation that has developed, I'm betting on their resurgence...

The road of excess leads to the palace of wisdom - William Blake