The Minnesota Timberwolves are also among the teams that have expressed strong interest in Blatt, but sources say that the lifelong Boston Celtics fan has decided to focus on the Warriors' assistant job if he can't get Cleveland's head-coaching job.
Blatt said at his Thursday night news conference in Tel Aviv that it was time to leave the European game behind "to meet other professional challenges that I have in my life."
"It's been a dream of mine for almost forever to go and join a team in the NBA in some capacity," Blatt said. "I wish I could have done it as a player. I wasn't good enough. But now perhaps I'll have that opportunity as a coach."
The Cavaliers and the Los Angeles Lakers are the only two NBA teams left with a head-coaching vacancy.
Information from The Associated Press was used in this report.