Ellis said: "It will be exciting to see how he goes. Crocky [Wyatt Crockett] had a YouTube video of him playing the other day and you could see him nailing people. It will be great to have him in the mix."
The Australian-raised Nadolo, who has played for Exeter in England and Bourgoin in France, will travel to Christchurch after the Japanese season finishes. Assistant coach Tabai Matson, who coached in Japan, was instrumental in Nadolo's signing after talking to NEC coach Greg Cooper, the former All Blacks fullback.
Robbie Fruean's move to the Chiefs and the decision by Julian Savea to stay at the Hurricanes meant the Crusaders were on the lookout for a powerful back. Blackadder confirmed Dan Carter was likely to be available following his sabbatical which ends after the June test series against England.
Elsewhere, Benji Marshall attracted attention at the Blues' Eden Park announcement, but coach John Kirwan insisted the expectation at the franchise this season would be greater than in his first. The "honeymoon" period is over, he said.
The Chiefs have again recruited strongly in their bid for a third successive title, with Liam Messam saying the addition of former All Black Mils Muliaina will help fill the leadership void created by Craig Clarke's departure to Ireland.
Highlanders coach Jamie Joseph has had little choice but to put his faith in youth. There will be interest in how Argentine prop Matias Diaz performs.