The 2018 Copa Libertadores qualifying stages are scheduled to be played from 22 January to 22 February 2018. A total of 19 teams compete in the qualifying stages to decide four of the 32 places in the group stage of the 2018 Copa Libertadores.
The draw for the qualifying stages was held on 20 December 2017, 20:00 PYST (UTC−3), 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 (E1–E3), with the seeded teams hosting the second leg.
For the second stage, the 16 teams were drawn into eight ties (C1–C8), 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 is 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 (G1–G4), with the second stage winners C5–C8 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.
In the qualifying stages, each tie is played on a home-and-away two-legged basis. If tied on aggregate, the away goals rule is used. If still tied, extra time is not played, and the penalty shoot-out is used to determine the winner (Regulations Article 29).
The qualifying stages are structured as follows:
The first legs will be played on 22 January, and the second legs will be played on 26 January 2018.