Third round: Six teams which had advanced from the second round were divided into two groups of three teams to play home-and-away round-robin matches. The two group winners met in a two-legged match with the winner advancing to the inter-confederation play-offs.
The OFC had considered different proposals of the qualifying tournament.[5] A previous proposal adopted by the OFC in October 2014 had the eight teams divided into two groups of four teams to play home-and-away round-robin matches in the second round, followed by the top two teams of each group advancing to the third round to play in a single group of home-and-away round-robin matches to decide the winner of the 2016 OFC Nations Cup which would both qualify to the 2017 FIFA Confederations Cup and advance to the inter-confederation play-offs.[6] However, it was later reported in April 2015 that the OFC had reversed its decision, and the 2016 OFC Nations Cup will be played as a one-off tournament similar to the 2012 OFC Nations Cup.[7]
Entrants
All 11 FIFA-affiliated national teams from the OFC entered qualification.[8] The four lowest ranked teams (based on FIFA World Ranking and sporting reasons[further explanation needed]) entered the first round, while the other seven teams entered the second round.
The draw for the second round was held as part of the 2018 FIFA World Cup Preliminary Draw on 25 July 2015, starting 18:00 MSK (UTC+3), at the Konstantinovsky Palace in Strelna, Saint Petersburg, Russia.[14]
While the results of the OFC Nations Cup knockout stage matches have no effect on the teams qualified for the third round of World Cup qualifying, for statistical purposes these matches are considered part of World Cup qualifying, with FIFA counting goalscorers in the qualifying statistics, and cards given may contribute to suspensions in the third round of World Cup qualifying (similar to the setup for 2014 World Cup qualifying).
^FIFA awarded Tahiti a 3–0 win as a result of the Solomon Islands fielding the ineligible player Henry Fa'arodo, after Tahiti had defeated the Solomon Islands 1–0. Fa'arodo failed to serve a one-game ban after receiving two yellow cards in the 2016 OFC Nations Cup.[18]
Final
The draw for the final (which decided the order of legs) was held on 15 June 2017, 16:00 NZST (UTC+12), at the OFC headquarters in Auckland, New Zealand.[19]
The winner of the final advanced to inter-confederation play-offs. Dates were set for the two-legged final as being between 28 August and 5 September 2017.[20]
The draw for the inter-confederation play-offs was held as part of the 2018 FIFA World Cup Preliminary Draw on 25 July 2015, starting 18:00 MSK (UTC+3), at the Konstantinovsky Palace in Strelna, Saint Petersburg.[3] The first-placed team from OFC was drawn against the fifth-placed team from CONMEBOL, with the OFC team hosting the first leg.[21]