two merging with the 2018 FIFA World Cup qualification In the first round, the lowest ranked teams played home-and-away over two legs to reduce the total number of teams to 40. In the second round, the 40 teams were divided into eight groups of five to play home-and-away round-robin matches, where the eight group winners and the four best group runners-up qualified for the 2019 AFC Asian Cup finals. In the third round, the next best 24 teams eliminated from second round were divided into six groups of four and competed for the remaining slots of the 2019 AFC Asian Cup. The first qualifying round of the qualification took place on 12 March 2015, and the final match of the third round took place on 27 March 2018. Qualified teams India, Syria, Thailand, and Turkmenistan qualified for the tournament after being absent in several Asian Cup tournaments spanning from 2004 to 2015. Lebanon and Vietnam both qualified for the first time after hosting the tournaments, in 2000 and 2007 respectively. For Vietnam, this was the first time they qualified for the AFC Asian Cup as a unified nation, having participated as South Vietnam in the first two editions (1956 and 1960), outside of hosting the 2007 edition. This was also the first time Yemen qualified for the AFC Asian Cup as a unified country, due to FIFA and AFC categorizing the participation of South Yemen in the 1976 as a distinct record not related to Yemen, who succeeded North Yemen. In addition to Yemen, Kyrgyzstan and the Philippines also marked this edition as their first times to qualify for an Asian Cup. Iran qualified for the Asian Cup for the first time as a CAFA member, having qualified as part of the WAFF before. Afghanistan, along with its fellow CAFA member nation Tajikistan, were the only two countries from the Central Asian zone which failed to qualify for the tournament. Indonesia and Malaysia were the only co-hosts of the 2007 edition that did not qualify for the Asian Cup, as Indonesia was barred from entering the qualification due to tension inside the PSSI which led to FIFA suspension; while Malaysia had ended their campaign in disaster with just one point out of six matches. Kuwait was the only West Asian team not to qualify for the Asian Cup, as they were also barred from completing the qualification due to FIFA's