Under such clauses, the player has the ability to specify teams to which they do not wish to be traded. The Vegas Golden Knights believed that Dadonov had not provided his list for the 2021-22 season and attempted to trade him to the Anaheim Ducks.
However, it was revealed that Dadonov had indeed submitted his list to the Senators, who failed to share this information with the Golden Knights. Subsequently, the NHL intervened and vetoed the trade to the Ducks, resulting in the punitive action against the Senators.