Philadelphia and Boston have agreed in principle on a trade where the 76ers would acquire the chance to take Markelle Fultz with the No. 1 pick in Thursday’s NBA Draft, a person with knowledge of the deal told The Associated Press.

The Celtics will get the No. 3 pick, plus an additional first-rounder in either 2018 or 2019, according to the person who spoke on condition of anonymity Saturday night because the trade has not been formally approved by the league. The agreement between the Celtics and 76ers was struck not long after Fultz worked out for Philadelphia on Saturday evening.

Once the trade goes through, Philadelphia will own the NBA’s No. 1 selection for the second straight season.