Suárez clashed with Italy defender Giorgio Chiellini during the South Americans' 1-0 win on Tuesday, with replays showing that he appeared to bite his opponent. The referee did not see the incident, though FIFA are investigating the incident.
This is of course not the first time he has been embroiled in such a controversy. He was given a 10 game ban for biting Branislav Ivanovic in April 2013, having been suspended for seven games for biting Otman Bakkal when playing for Ajax.
Roberto Martinez believes he may need help to control his behaviour, he told ESPN:
"There is no doubt that the quality of the talent that he has. "He can win games single-handed and he's got that focus, that mentality that he can get back from a situation he shouldn't have derived.
"But the behaviour, I just seriously think that he needs help," he continued. "If you cannot control yourself in those moments, you need some sort of help because that's just unacceptable on a football pitch.
"This is a behaviour that has happened already two times and Luis Suarez, as a wonderful footballer that he is, has been banned twice. It has been such a controversial way of acting on a football pitch that you see it again and everyone feels upset.
"We can't celebrate [the game]. We can't talk about what Uruguay did. We can't talk about why Mario Balotelli didn't come on in the second half. It's about how Luis Suarez is allowed to play the game without carrying that responsibility that you have as a player, being a role model to the younger generation. You cannot justify it."
You can watch the video of the incident below.
Do you think Suárez bites Chiellini? Does he now deservea lengthy ban? Vote and comment below.