-- Suarez received a nine-game international match suspension and a four-month ban from all football activity for biting the shoulder of Italy defender Giorgio Chiellini during their group game at the World Cup finals. He denied it before apologising although Barcelona are believed to have put pressure on him to do so if they were to pursue their interest in him. Chiellini said it was water under the bridge and even said the striker's punishment was too harsh but it fell on deaf ears at FIFA.

-- Suarez was dubbed 'the cannibal of Ajax' after he bit PSV Einhoven's Otman Bakkal shoulder in a Dutch league game in November 2010, months after a controversial handball at the World Cup. The referee did not immediately see the incident, but Suarez was later handed a seven-game ban. In April 2013, Suarez bit Chelsea's Branislav Ivanovic's arm in a Premier League game for Liverpool. He was given a 10-game suspension for that offence.

-- The Uruguayan, considered one of the world's most devastating goalscorers, has also been in trouble over on the field comments. He hurled racial abuse at Manchester United's Patrice Evra during a Premier League game in October 2011. Suarez insisted the term he used was one often deployed in Uruguay. The English FA banned him for eight matches and fined him �40,000 ($68,000). He refused to shake hands with Evra when the two teams met later that season.

-- Suarez stopped a certain Ghanaian goal with his hand on the goalline in the last minute of extra-time in the 2010 World Cup quarter-final. He was sent off but Asamoah Gyan's penalty was saved and the Ghanaians went on to lose the penalty shootout. "I made the save of the tournament," was Suarez's unrepentant comment after the match.

-- Suarez appeared to have got over his past controversies this year at Liverpool. He scored 31 goals in the English Premier League in 2013-14 and was named player of the season by the Professional Footballers Association. Also scored two goals against England in their World Cup group game just weeks after undergoing knee surgery.