If you just finished a game with a random player who was toxic, you don't need to add them to block them. You can do it immediately from the match history.

If you finished a match and decided you never want to hear from a teammate or opponent again: Go to the tab in the main menu. Select the specific match where you encountered the player. Navigate to the Scoreboard tab. Right-click the player's name and select Block . 3. During an Active Match

If you just want to shut someone up during the current game but don't care about the future:

When you block a player in Valorant, the following restrictions apply: