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Nadolo currently plays for NEC Green Rockets in the Japan Top League and at 1.95 metres and nearly 130kg will take some stopping.
Nadolo has also captained the Fijian Warriors team and spent one Super Rugby season with the Waratahs in 2009.
Todd Blackadder said he is set to be one of the most exciting players in the 2014 Super Rugby competition.
"He is an absolute hulk of a man, yet he can fly down the field like you wouldn't believe for a man that size. Comparisons have been drawn with Jonah Lomu, and we can't wait to work with him and unleash him in this competition," Crusaders coach Todd Blackadder said.