If Greece leaves the Eurozone?

I am Greek I live and work in UK since 2009. I only have greek passport for now its OK.But will I need to apply for VISA if Greece leaves EU ? or:I am

I am Greek I live and work in UK since 2009. I only have greek passport for now it's OK.
But will I need to apply for VISA if Greece leaves EU ?

or:I am Greek I live and work in UK since 2009. I only have greek passport for now it's OK.But will I need to apply for VISA if Greece leaves EU ?

or:no, but if it leaves/it is excluded from EU, yes

Tags:work,2009,