The G League MVP is now eligible for the NBA playoffs.
Brown had been on a two-way deal, and he is with the Raptors for their regular-season finale at Miami.
He averaged 18.8 points and 8.9 assists for Raptors 905 this season on his way to winning the G League MVP. In 14 appearances with Toronto this season entering Wednesday, Brown has averaged 2.3 points and 1.1 rebounds.
Brown had a season-high 11 points against Detroit on Monday.