Australian Matthew Dellavedova is set to join the Milwaukee Bucks on a lucrative four-year deal.

Dellavedova will join the Bucks from Cleveland in a deal worth US$38.4 million ($AUD51.2 million).

The deal will be the biggest ever signed by an Australian in the NBA.

The Cavs have until July 10 to match the offer, but that seems highly unlikely.

The 25-year-old enjoyed a career best year last season, averaging 7.5 points and 4.4 assists per game.