Pressey played the last two seasons with the Boston Celtics, averaging 3.1 points, 1.5 rebounds and 2.9 assists in 125 games. The 24-year-old was undrafted after playing at Missouri.
Alexander also went undrafted after averaging 7.1 points and 5.3 rebounds after one season at Kansas. His 56.6 percent field goals percentage led the Jayhawks and ranked fourth in the Big 12.
Alexander was a 2014 Naismith Boys High School Player of the Year as well as a McDonald's All-American.