The moves bring the Raptors’ roster down to 17 players, two more than the maximum allowable amount once the season begins.
Toronto has 12 guaranteed contracts on the books for next season, meaning the team holds three regular roster positions and two two-way deals to offer a combination of Chris Boucher, Malcolm Miller, Oshae Brissett, Isaiah Taylor and Dewan Hernandez.
Robinson played seven games with the Washington Wizards last season averaging 6.7 points, 2.9 rebounds and 13.6 minutes. The six-foot-eight, 200-pound forward averaged 19.9 points, 8.2 rebounds and 34.4 minutes in the G League.
Payne, a 24-year-old from Memphis, Tenn., averaged 6.3 points, 2.7 assists and 17.8 minutes in 40 games (13 starts) with the Chicago Bulls and Cleveland Cavaliers last season.
Morgan, whose signing with the Raptors was announced Thursday, played four seasons at Cornell University, averaging 20.5 points, 4.2 rebounds, 2.6 assists across his 114-game collegiate career. He was named to the first-team All-Ivy League as both a junior and senior.
In four Summer League appearances, he averaged 4.3 points, two rebounds and one assist in 13.8 minutes of action, shooting just 18 per cent from the field overall.