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Greece's position

The Greek government officially recognises only one minority - the Muslim minority of Thrace
It has historically regarded the Macedonian Slavs of Greek Macedonia as a linguistic rather than a national group, referring to them as Slavophone Greeks or bilingual Greeks
A document issued in the early 1990s, says that "almost all the bilingual inhabitants of the area whose national consciousness was not Greek moved to neighbouring states" in the first half of the 20th Century - by implication, any bilingual people who remained possessed Greek national consciousness
The Prespa agreement says the nationality of the people of North Macedonia is "Macedonian/citizen of the Republic of North Macedonia" - which, as the Greek government emphasises, makes no presumption about the existence of a Macedonian ethnicity

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Update 1 March 2018: The language used in this story has been clarified in two places. An error concerning a change to the Macedonian constitution has been removed, and extra information regarding Greece's position with regard to its Slavic-speaking community has been added, including a link to a letter to the BBC from the country's ambassador to the UK.