Armed men kill 30 villagers in Mali attacks, say local officials
He reiterated that he was open to forming a government of national unity, and appointing new judges to Mali's highest court, another central opposition demand.
Keita said mediators from the regional West African body ECOWAS were expected to return to Mali in the coming days to help find a solution to the crisis.
There was no immediate response from the opposition, which earlier called for another protest in the capital Bamako on Friday, saying proposals put forward so far by the government were insufficient.
Thousands of opposition supporters took to the streets twice in June demanding that Keita, who was re-elected in 2018 for a second five-year term, resign for failing to offer solutions to Mali's security and economic crisis.
Mali has struggled to find stability since a 2012 military coup that was followed an uprising by Tuaregs in the north later hijacked by Islamist militants.