Ecuador's National Assembly will meet at 6:00 pm (2300 GMT) on Saturday to vote on whether or not to oust Lasso, a conservative ex-banker who took power a year ago and who is self-isolating after a Covid-19 diagnosis.
Protesters are demanding a cut in already subsidized fuel prices, which have risen sharply in recent months, as well as jobs, food price controls, and more public spending on healthcare and education.
The vote takes place at the request of the 47 lawmakers of the leftist opposition Union for Hope coalition.
Lasso's dismissal would require 92 votes out of 137 in the assembly, in which opposition parties are in the majority.