The trainer recognised Poland's superiority as his side went down to Arkadiusz Milik's strike, and called on his players to give their all in the next clash against Ukraine
Northern Ireland coach Michael O'Neill has admitted Poland were simply the better team and fully deserved their 1-0 win at the Stade de Nice on Sunday.
Poland were in charge right from the start as they pinned Northern Ireland back in their own half and were eventually rewarded when Arkadiusz Milik found the net after the interval.
O'Neill feels his side did well to keep their chances of salvaging a draw alive right until the final whistle, but acknowledged they did not deserve a point.