Britain should not be forced out the EU as quickly as possible, Poland's foreign minister Witold Waszczykowski has said.
"We need a longer reflection," Mr Waszczykowski told Polish state television TVP Info.
"This cannot be [a] hasty action, this cannot consist of forcing Britain out and as fast as possible."
Mr Waszczykowski said more should have been done to keep Britain in the bloc, adding that EU officials were partly responsible for Britain's vote to leave.
On Friday, Poland said the EU needed a new treaty to increase the role of sovereign nations and preserve the bloc's unity following the result of Britain's EU referendum.
A second half goal from Arkadiusz Milik gave Poland an opening win in a close Group C encounter with Northern Ireland in Nice.
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The president of Poland, Bronislaw Komorowski, has stepped down after an exit poll showed him losing to his conservative rival, Andrzej Duda by six points in Sunday's election.
Komorowski had originally been favourite to retain the position, but his defeat has reflected a desire among voters for new faces, and a sense that Poland's new-found prosperity was not being shared out equally.
43-year-old Duda's win is the first in nearly a decade for the Law and Justice party, which is socially conservative and close to the Catholic Church, but less friendly to business than the incumbent Civic Platform Party.
"I respect your choice," Komorowski told a gathering of supporters. "I wish my challenger a successful presidency."
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