Speaking to the German Handelsblatt newspaper on March 16, Juncker said "Turkey is currently not ready for accession".
Jean-Claude Juncker expressed he was "cautiously optimistic" about an agreement expected to be reached for an EU-Turkey action plan to tackle the refugee crisis.
The EU and Turkey have paved the way of visa liberalization negotiations in exchange for Turkey's help to stem the refugee flow.
"In the coming days, we will conclude a binding agreement with Turkey, which we had already prepared during the last summit" Juncker told Handelsblatt newspaper.
"Every illegal migrant will go through an individual asylum process [and] will always have a right to appeal" Juncker added via his Twitter account.