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The 24 teams were divided into six groups of four teams to play home-and-away round-robin matches. The top two teams of each group qualified for the 2019 AFC Asian Cup, where they were joined by the 12 teams which qualified directly from the second round.
Guam withdrew from the tournament due to financial constraints. The All Nepal Football Association announced on 27 December 2016 that they accepted an offer from the AFC to replace Guam.
The Kuwait Football Association was suspended by FIFA. Kuwait had a deadline of 11 January 2017 for lifting of the suspension, but they were unable to do so and were replaced by Macau.
Due to the withdrawal of Guam and the suspension of Kuwait, the AFC invited both Nepal and Macau, the top two teams of the 2016 AFC Solidarity Cup, to re-enter 2019 AFC Asian Cup qualification as replacements in order to maintain 24 teams in the third round of the competition.
The draw for the third round was held on 23 January 2017, 16:00 GST (UTC+4), in Abu Dhabi, United Arab Emirates. It was initially scheduled for 18 January 2017, but was delayed.
The 24 teams were drawn into six groups of four. They were seeded using the January 2017 FIFA World Rankings (indicated in parentheses below).
The national teams which eventually qualified are presented in bold.
The top two teams of each group qualified for the final tournament.
Tiebreakers
The teams were ranked according to points (3 points for a win, 1 point for a draw, 0 points for a loss). If tied on points, tiebreakers were applied in the following order (Regulations Article 9.3):
Goals scored in head-to-head matches among tied teams;
Away goals scored in head-to-head matches among tied teams;
If more than two teams were tied, and after applying criteria 1 to 4, a subset of teams were still tied, criteria 1 to 4 were reapplied exclusively to this subset of teams;
Goal difference in all group matches;
Goals scored in all group matches;
Penalty shoot-out if only two teams were tied and they met in the last round of the group;
Disciplinary points (yellow card = 1 point, red card as a result of two yellow cards = 3 points, direct red card = 3 points, yellow card followed by direct red card = 4 points);
^ Since the Government of Kyrgyzstan had advised them that the AFC Asian Cup 2019 Final Round Group A qualifying match between Kyrgyz Republic and Myanmar should not take place in Bishkek as scheduled on 5 September 2017 due to increased security concerns following Myanmar military clearance operations against Rohingya in August-September 2017, the AFC decided to postpone the match. On 24 November 2017, the AFC announced that the match will be played on 22 March 2018 at a neutral venue, with the Football Federation of the Kyrgyz Republic covering all the costs of the Myanmar team and of the match organisation, including airfares and accommodation. The two Member Associations will be requested to agree on the neutral venue, and if they fail to reach a consensus the AFC will make the appointment. On 12 February 2018, the Football Federation of the Kyrgyz Republic announced that the match is to be played in Incheon, South Korea.
^ Due to the death of Kim Jong-nam that led to a diplomatic crisis between Malaysia and North Korea, the Malaysian government decided to disallow the Malaysian football team from playing in North Korea for safety reasons. On 10 March 2017, the Asian Football Confederation (AFC) announced that North Korea's home match against Malaysia, originally scheduled for 28 March at the Kim Il-sung Stadium in Pyongyang, would be postponed, with the AFC announcing on 15 March 2017 that the match would be played on 8 June. On 17 May 2017, the AFC announced that the match was postponed for a second time, to 5 October, due to "geo-political tension on the Korean Peninsula". On 28 September 2017, the AFC announced that the match was again postponed after the Malaysian government announced a travel ban on Malaysian nationals visiting North Korea. On 20 October 2017, the AFC announced that both matches between North Korea and Malaysia would be played at a neutral venue in the interests of competition fairness, with North Korea's "home" match played on 10 November 2017 and Malaysia's "home" match played on 13 November 2017.
^ On 15 March 2017, the AFC announced that should diplomatic relations between the two countries not return to normal, the match between North Korea and Malaysia would be played at a neutral venue, and Malaysia's home match against North Korea would also be moved to a neutral venue to preserve sporting values and the spirit of fair play. After the AFC received confirmation that Malaysians were allowed to travel to North Korea, the AFC agreed that the match would be played in Pyongyang. However, at the announcement of the second postponement, the AFC said the venue would be decided after monitoring the safety and security of the AFC Cup and AFC U-23 Championship qualifying matches taking place in North Korea in the coming months. On 20 October 2017, the AFC announced that both matches between North Korea and Malaysia would be played at a neutral venue in the interests of competition fairness, with North Korea's "home" match played on 10 November 2017 and Malaysia's "home" match played on 13 November 2017, which were later confirmed to be played at Thailand.
^ Afghanistan played their home matches in Tajikistan due to security concerns from the war in Afghanistan.
^ The Singapore - Chinese Taipei match, originally scheduled for 13 June 2017 at the Singapore National Stadium, was brought forward at the request of the Football Association of Singapore to accommodate a possible Singapore - Argentina friendly at the same location on 13 June. In addition, the game will be held away from the Singapore National Stadium due to the venue hosting a rugby test match between Scotland and Italy on the new date.
"World Cup draw looms large in Asia". FIFA.com. 13 April 2015. Archived from the original on April 16, 2015. Completing the tournament's qualifying contenders will be the next 16 highest ranked teams, with the remaining 12 sides battling it out in play-off matches to claim the last eight spots.
Khalid Al-Hajri 
Palestine
Jordan
Kyrgyzstan
Hong Kong
Turkmenistan
Guam
Singapore
Afghanistan
Vietnam
Lebanon
Kuwait
Myanmar
North Korea
Philippines
Bahrain
Nepal (replaced Guam)
Macau (replaced Kuwait)
90+1'
Chinese Taipei
