Karauna is 30 and a utility back who can play at wing, centre and full-back and was recently chosen for the New Zealand Sevens squad.
Ospreys rugby manager Derwyn Jones said: ``Adrian has pace and is an accomplished goal-kicker and all-round footballer who would have won a sackful of All Blacks caps were it not for Christian Cullen. ``It is widely recognised in New Zealand that he would have had 10 years of international rugby were it not for Cullen and his quality and ability is exceptional.
``He is an excellent professional and I am sure our younger players will learn a lot from him.''
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