Former New Zealand skipper Martin Crowe raised concerns over David Warner's "thuggish behavior" and said that soon it will lead to an incident that will tarnish the sport's image.<p></p><p></p>Recently even Australian great Ian Chappell was quoted saying, "soon enough someone will get king-hit on a cricket field. Warner may just be the one who gets pinned by someone in retaliation. And if it is him who gets hammered, it will be overdue - if wrong".<p></p><p></p>In his <em>Espncricinfo column</em>, Crowe also mentioned that the sport must introduce a yellow and red card system like football to keep the track such behaviour.<p></p><p></p>"Fining these serial offenders is not going to work. You have to take them out of the game for extended periods. Two yellow cards should result in a red card, which should ban any player for six months. This is the only way it will be dealt with. My concern in the immediate future will be that Warner will be in the centre of an ugly on-field fight during the upcoming World Cup", said Crowe.<p></p><p></p>Crowe was extremely hard on Warner's behaviour and the impact it has on the thousands viewing the sport. He raised some harsh questions as he added, "There are others who are borderline, but Warner is the worst culprit. So what is it to be, ICC? Shall we wait for a king hit in front of thousands of kids watching, and the many women who are enjoying supporting husbands and boyfriends who are devoted to the game? Do we wait for blood to be spilt on the pitch, lawsuits to follow? Do we sit by and watch this ever- increasing thuggery grow into a runaway train dragging cricket through another unnecessary controversy?"<p></p><p></p>Warner once again got into an on-field altercation on Sunday, this time with Indian opening batsman Rohit Sharma. This led to Warner being fined 50 percent of his match fees.