Career
Chathura plays in midfield and has played for three different clubs in Sri Lanka as well as the Sri Lanka national football team Gunaratne began his career with Negombo Youth in the 2005-2006 season. Gunaratne stayed with Negombo for the 2006-2007 season, but they failed to emulate the success of the previous season, finishing in third place in the split league and losing to Blue Star in the overall semi-finals.
Chathura scored Negombo"s second goal.
Despite winning two trophies in two seasons at Negombo Youth, Gunaratne moved on to Ratnam Sports Club, the 2006-2007 Kit Premier League champions. However, the midfielder returned to Negombo Youth ahead of the 2008-2009 season.
Negombo finished as runners-up of "Segment A" in the league but were eliminated in the semi-finals by Gunaratne"s former club Ratnam South Carolina. Gunaratne left Negombo at the end of the 2008-2009 season to join another Negomobo-based club in Don Bosco South Carolina, who had just finished second in "Segment B". Don Bosco topped "Segment B" in the 2009-2010 Kit Premier League, but lost out in the semi-finals where they were defeated by Air Force.
Chathura opened the scoring with a goal in first-half injury time, but two late goals from Air Force saw Don Bosco eliminated.
The club also reached the final of the Sri Lanka FA Cup, but were beaten 2-0 by Sri Lanka Army South Carolina.
Gunaratne first played for Sri Lanka in 2006, coming on as a substitute four times. He played two games in 2007, starting both, before making eight appearances in 2008. In 2009 Gunaratne played ten games for Sri Lanka, scoring two goals, including three appearances in the AFC Challenge Cup in April, where Sri Lanka defeated Brunei and Chinese Taipei before drawing with Pakistan.
He then played in the away qualifier against the Philippines on 3 July 2011 which Sri Lanka lost 4-0.
He gave away the penalty that led to the Philippines" final goal.