Complete 7 tackles with Vušković not working

You could try adjusting a few gameplay settings to make this easier. For example, turn off player auto-switching in the Gameplay settings, or even disable auto-play entirely. See if that helps.

After that, it’s just a matter of manually aiming for the tackle with that player once you lose the ball.

Let me know if the counter for the task does not change at all, despite completing the tackle with the player from the task description. 

Update: Please also make sure you use the player item version from this event when completing skill games.