Poland is unlikely to leave the European Union, even if the ruling eurosceptic Law and Justice (PiS) party wins re-election this year, EU executive head Jean-Claude Juncker said.

In response to a question by the Polish daily, Rzeczpospolitaon on whether there will be a "Polexit" after parliamentary elections in Poland in the autumn, Juncker said: "No."

"Poland is with us (the European Union) because we have common values," Juncker said.

His statement came as Poland's biggest opposition front has repeatedly warned that Law and Justice could eventually lead the country out of the EU.