The 24-year-old has 65 Super Rugby caps, 31 of those with the Rebels.
Fainga'a appeared in every Rebels match last season, starting in seven of those matches and scoring a try and was co-captain of the Melbourne Rising in last year's NRC competition.
Melbourne coach Tony McGahan feels Fainga'a can also take the next step up and challenge for a place in the Wallabies squad.
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