The FIBA World Cup begins at the end of the month.
Barrett reportedly suffered a mild calf strain during Summer League, per Charania. He will join the Canadian team for training camp in Toronto, but will not make the trip to China for the FIBA festivities.
New York selected Barrett with the No. 3 pick in June's 2019 NBA draft. The Duke product averaged 22.6 per game with the Blue Devils in his lone collegiate season.
Nuggets point guard Jamal Murray and Thunder point guard Shai Gilgeous-Alexander are among the players invited to play for Team Canada in the FIBA World Cup. Kemba Walker and Donovan Mitchell are expected to lead the United States' squad.
The 2019 FIBA World Cup will begin on Aug. 31.