D'Arcy Waldegrave: Sportstalk host on former All Blacks coach Steve Hansen joining up with the Wallabies - Heather du Plessis-Allan Drive

Sir Steve Hansen shocked rugby fans everywhere by seemingly defecting to New Zealand's greatest rugby rival.

Hansen later revealed he joined up with the Wallabies as a favour to their coach - and his mate - Eddie Jones ahead of their final World Cup warm-up game against France.

Sportstalk host D'Arcy Waldegrave explains further.

LISTEN ABOVE

See omnystudio.com/listener for privacy information.