Ospreys Cup Under 16 2013 - 2014
England forward Maro Itoje needs surgery on a broken hand, adding to coach Eddie Jones' injury problems at open-side flanker.
Wales will have England-based George North and Jamie Roberts available to face Australia after a "one-off" change of policy by Premiership Rugby.
Ireland head coach Joe Schmidt agrees a contract extension and will stay in charge until the end of the World Cup in 2019.
Former Bath boss Mike Ford is named head coach of three-time European champions Toulon, replacing Diego Dominguez.