Peter O'Mahony warns that Ireland must improve "across the board" to stay on top of the world.
O'Mahony, 33, remains a mainstay of Farrell's set-up and his performance against South Africa close to a fortnight ago underlined that.
However there is a feeling in the Ireland camp that, while beating the World Cup winners was a boost, the performance wasn't where the players and management wanted it to be.
