The 2018 Copa Libertadores qualifying stages were played from 22 January to 22 February 2018. A total of 19 teams competed in the qualifying stages to decide four of the 32 places in the group stage of the 2018 Copa Libertadores.
<section begin=Draw /> The draw for the qualifying stages<includeonly> and group stage</includeonly> was held on 20 December 2017, 20:00 PYST (), at the CONMEBOL Convention Centre in Luque, Paraguay.
Teams were seeded by their CONMEBOL ranking of the Copa Libertadores (shown in parentheses), taking into account of the following three factors:
For the first stage, the six teams were drawn into three ties (E1âÂÂE3), with the seeded teams hosting the second leg.
For the second stage, the 16 teams were drawn into eight ties (C1âÂÂC8), with the seeded teams hosting the second leg. Teams from the same association could not be drawn into the same tie, excluding the winners of the first stage, which were unseeded and whose identity was not known at the time of the draw, and could be drawn into the same tie with another team from the same association.
For the third stage, no draw was made, and the eight teams were allocated into the following four ties (G1âÂÂG4), with the second stage winners with the higher CONMEBOL ranking hosting the second leg. As the identity of the winners of the second stage was not known at the time of the draw, they could be drawn into the same tie with another team from the same association.
<section begin=Format /> In the qualifying stages, each tie was played on a home-and-away two-legged basis. If tied on aggregate, the away goals rule was used. If still tied, extra time was not played, and a penalty shoot-out was used to determine the winner (Regulations Article 29).<section end=Format />
<section begin=Bracket /> The qualifying stages were structured as follows:
The bracket was decided based on the first stage draw and second stage draw, which were held on 20 December 2017.
The first legs were played on 22 January, and the second legs were played on 26 January 2018. <section begin=First stage />
<section end=First stage />
Olimpia won 2âÂÂ0 on aggregate and advanced to the second stage (Match C5).
Tied 1âÂÂ1 on aggregate, Deportivo Táchira won on away goals and advanced to the second stage (Match C1).
Tied 3âÂÂ3 on aggregate, Oriente Petrolero won on away goals and advanced to the second stage (Match C3).
The first legs were played on 30âÂÂ31 January and 1 February, and the second legs were played on 6âÂÂ8 February 2018. <section begin=Second stage />
<section end=Second stage />
Santa Fe won 3âÂÂ2 on aggregate and advanced to the third stage (Match G1).
Nacional won 2âÂÂ0 on aggregate and advanced to the third stage (Match G2).
Jorge Wilstermann won 4âÂÂ3 on aggregate and advanced to the third stage (Match G3).
Guaranàwon 6âÂÂ1 on aggregate and advanced to the third stage (Match G4).
Junior won 3âÂÂ2 on aggregate and advanced to the third stage (Match G4).
Vasco da Gama won 6âÂÂ0 on aggregate and advanced to the third stage (Match G3).
Tied 3âÂÂ3 on aggregate, Banfield won on away goals and advanced to the third stage (Match G2).
Santiago Wanderers won 2âÂÂ1 on aggregate and advanced to the third stage (Match G1).
The first legs were played on 13âÂÂ15 February, and the second legs were played on 20âÂÂ22 February 2018. <section begin=Third stage />
<section end=Third stage />
Santa Fe won 5âÂÂ1 on aggregate and advanced to the group stage (Group D).
Nacional won 3âÂÂ2 on aggregate and advanced to the group stage (Group F).
Tied 4âÂÂ4 on aggregate, Vasco da Gama won on penalties and advanced to the group stage (Group E).
Junior won 1âÂÂ0 on aggregate and advanced to the group stage (Group H).
<section begin=Copa Sudamericana qualification /> The two best teams eliminated in the third stage entered the Copa Sudamericana second stage. Only matches in the third stage were considered for the ranking of teams.
<section end=Copa Sudamericana qualification />