By NEALE HARVEY

DONNCHA O’Callaghan reckons forceful Irish back rower Peter O’Mahony is a viable contender for the Lions captaincy if Sam Warburton fails to recover from a knee injury in time for New Zealand.
Wales flanker Warburton has emerged as favourite to lead the Lions for a second time, while Alun Wyn Jones, Owen Farrell, Rory Best and Dylan Hartley have their supporters.
However, O’Callaghan believes Munster captain O’Mahony’s work ethic and selfless nature, epitomised in a sensational display for Ireland in last month’s Six nations victory over...