The NBA-title winner's return is being billed as the biggest NBL homecoming since Andrew Bogut's move to Sydney three years ago.

The Cleveland Cavaliers guard won a ring as LeBron James' right-hand man in 2016, but has recently struggled with injuries that included a concussion that saw him miss the bulk of the recent season.

Dellavedova, who will play a key role in the Boomers' pursuit of an Olympic medal later this month, will join the defending NBL champions as they hunt a third title in four years.

"I am really excited to sign with Melbourne United and come back to the NBL. It's a great team with a winning culture and some great teammates that I've loved playing with in the past for the Boomers," Dellavedova said on the club's website.

"Melbourne is close to family and my hometown of Maryborough and I have always wanted to come back here and play at some point.

"The NBL is a quality league that continues to evolve and has a lot of respect around the world - I'm excited for the challenge and continuing to help grow the game of basketball in Australia."

The point guard played eight seasons in the NBA after going undrafted, earning cult status in Cleveland because of his incredible hustle and desperation.

- WITH AAP

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