THIS! Specially since there's no instant replays for tackles that lead to injuries, refs need to step up and do their job. That Perez cisor tackle from a high position, locking Iniesta's knees which was moving fast, was some martial arts move! Even though he got to the ball, he had zero control over his momentum. There should be rule banning tackles if contact is made with opponent's knees.I'd totally vote for a 2 instant replay challenge per game for each team.
Hope Andres will be ok...
ps. btw, how do I go about liking a post? Is there a button? Thx