Draw
The draw for the group stage was held on 17 December 2018, 20:30 PYST (UTC−3), at the CONMEBOL Convention Centre in Luque, Paraguay.[3][4][5]
Teams were seeded by their CONMEBOL ranking of the Copa Libertadores as of 15 December 2018 (shown in parentheses), taking into account the following three factors:[6][7][8]
- Performance in the last 10 years, taking into account Copa Libertadores results in the period 2009–2018
- Historical coefficient, taking into account Copa Libertadores results in the period 1960–2008
- Local tournament champion, with bonus points awarded to domestic league champions of the last 10 years
For the group stage, the 32 teams were drawn into eight groups (Groups A–H) of four containing a team from each of the four pots. Teams from the same association could not be drawn into the same group, excluding the four winners of the third stage, which were allocated to Pot 4 and whose identity was not known at the time of the draw, and could be drawn into the same group with another team from the same association.
| Pot 1 | Pot 2 | Pot 3 | Pot 4 |
|---|---|---|---|
|
|
|
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- Notes
- ^ TH The defending Copa Libertadores champions were automatically seeded in Pot 1 and allocated to Group A.
- ^ CS The defending Copa Sudamericana champions were automatically seeded in Pot 2.
- ^ † The identity of the team Bolivia 2 was not known at the time of the draw, and was seeded in Pot 4.
The following were the four winners of the third stage of qualifying which joined the 28 direct entrants in the group stage.
| Match | Third stage winners |
|---|---|
| G1 |  Atlético Mineiro (10)
|
| G2 |  Melgar (80)
|
| G3 |  Libertad (23)
|
| G4 |  Palestino (84)
|
