Ireland's Foreign Minister Simon Coveney had swiftly rejected the Polish proposal earlier on Monday.

"I am completely with my Irish colleague. He has already said what he thinks of it, which is nothing," Maas told journalists after talks in Brussels.

Maas urged unity among the 27 countries staying in the European Union. The bloc awaits new ideas from London, after the British parliament struck down the Brexit deal Prime Minister Theresa May had negotiated with the EU.

(Writing by Gabriela Baczynska and Alastair Macdonald; Editing by Catherine Evans)