When the day comes that Johnny Sexton hangs up his boots for good, Leinster and Ireland will need to have a captaincy plan in place.
The day will still probably be the end date for Ireland's France 2023 World Cup journey, though Sexton did prise open the door for a career extension during the November series.
Sexton is practically irreplaceable in terms of the drive he brings to a team, but Leo Cullen and Andy Farrell will have to fill the void. There will be some contenders to step up.