The former Virginia star was named 2016 NBA Rookie Of The Year by the Milwaukee Bucks. He averaged 19.1 points, 5.9 rebounds, and 5.9 assists per match last season.
He will be an important addition to the Celtics team, which reached the NBA Finals last month but lost in six to the Golden State Warriors.
The fact that the Celtics did not have a true guard was a major concern going into the offseason.
Adrian Wojnarowski, ESPN's reporter on trades, first reported the details about the trade over a week prior.
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