A deal next week on unblocking new loans for Greece is seen as crucial to prevent Athens from defaulting on debts due in July.
Rival leaders of ethnically divided Cyprus have agreed on new talks in Geneva this month.
Greece's economy expanded in the first three months of 2017, upwardly revising a previous flash estimate in May that showed a 0.1 percent quarterly contraction.
Born in 1918, Mitsotakis had quit politics in 2004, stepping down as Greece’s longest-serving parliamentarian.
Launching her Annual Report 2016, the European Ombudsman, Emily O'Reilly, has published practical advice for EU officials on interacting with interest representatives.