Interior Minister Adan Augusto Lopez also plans to resign next week to focus on his own presidential bid, two government sources told Reuters.
If MORENA's board decides that on Sunday, then interior minister Lopez and Mexico City Mayor Claudia Sheinbaum, two other top contenders, would need to resign, Lopez Obrador said at a regular press conference.
Lopez Obrador made the remark after observing that more contenders could follow Ebrard's lead in the next few days.
Supporters of Ebrard argue his post does not allow him to focus as much on domestic issues as Sheinbaum and Lopez.
Lopez Obrador did not immediately name a replacement for Ebrard, who is due to step down next Monday.
Persons:
Andres Manuel Lopez Obrador, Marcelo Ebrard, Ebrard, Lopez Obrador, Adan Augusto Lopez, Mario Delgado, Lopez, Mexico City Mayor Claudia Sheinbaum, Ricardo Monreal, MORENA, Dave Graham, Diego Ore, Stefanie Eschenbacher, Matthew Lewis, David Gregorio, Grant McCool
Organizations:
MEXICO CITY, Foreign, Regeneration, Reuters, Mexico City Mayor, Thomson
Locations:
MEXICO, Ebrard