OAKLAND, CA - JUNE 02: Matthew Dellavedova #8 of the Cleveland Cavaliers calls out in the first half while taking on the Golden State Warriors in Game 1 of the 2016 NBA Finals at ORACLE Arena on June 2, 2016 in Oakland, California. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Thearon W. Henderson/Getty Images)

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.