Poeltl, who was drafted ninth overall in the 2016 draft, has played in eight NBA games this season. The 21-year-old is averaging 3.8 points and 4.6 rebounds.
All three players were in action for Raptors 905 on Saturday in a 100-91 loss to the Maine Red Claws. VanVleet had a game-high 23 points and Poeltl added 21 points and 15 rebounds.
The Raptors return to Air Canada Centre on Monday night against the Philadelphia 76ers. Toronto is coming off a five-game road trip and has won two in a row.