Celtics: 2023 13th pick
Raptors: Brogdon, Prichard, 2023 Celtics 35th pick (via Blazers), 2024 Spurs second round pick (via Celtics)
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Brogdon
Trent Jr
Anunoby
Barnes
Poeltl
Siakam, Prichard, Porter Jr, Boucher
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Jakob Poeltl prefers not to be in a rebuilding situation next season, per Draft Express
Considering this, and the fact that Fred VanVleet (reportedly) wants 30 + million per season, Brogdon would be a perfect solution for the Raptors.
For the Celtics, they can either use the pick, or flip it for a veteran.