Though Allen was unheralded out of high school, he improved enough in college to
draw NBA interest. Last season, he averaged 9.8 points (on 45.3 percent from the
field and 42.7 percent from three), 4.0 rebounds, 3.0 assists and 1.6 steals
across 30.0 minutes per game as a redshirt senior at Arizona. In signing a
two-way deal with the Celtics, who have one of the deepest rosters in the NBA,
Allen can spend up to 45 days in the NBA, but will largely be a G-League
presence for the team.