Josh Richardson cannot be traded this year since he signed an extension after August 6th.

Juancho Hernangomez cannot be traded to a team aggregated with other players from his team because 2 months have not passed since he was traded for. He can only be traded away to a team by himself and other non-player assets from his team (draft picks, cash considerations, etc). This restriction expires after Nov 14, 2021.

Dennis Schroder cannot be traded because 3 months have not passed since he was signed. He will be eligible to be traded after Nov 11, 2021.