Full coverage: Johnny Sexton

Rugby unions all over the world are facing increased pressure to address the concussion problem in the game.

A series victory in New Zealand is an extraordinary achievement in its own right but there is another prize at stake and now is the time for Andy Farrell to experiment.

Ireland's performance against Japan was radically different to the first two years under Andy Farrell and the Joe Schmidt era but at this delicate stage of development, a heavy defeat against New Zealand would be a killer blow.