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He made the announcement at a press conference on Wednesday morning, after visiting Mr Buhari at the London hospital where he is being treated for an unspecified illness.
Mr Osinbajo, now back in Nigeria, said he had discussed a wide range of issues during the hour-long meeting.
Mr Buhari has been in London since May.
Africa Live: Updates on this and other stories
The 74-year-old leader was elected to power in 2015, becoming the first Nigerian  opposition leader to win an election.
It is his second period of medical leave in the UK, the first began in January and he returned home in March.
His long absence has led to speculation about whether he will be able to resume his presidential duties.
In his absence, President Buhari has given Vice-President Osinbajo full powers to act, in contrast to the situation in 2009, when the long illness of then President Umaru Yar'Adua led to a power vacuum.
By Ibrahim Shehu, BBC Hausa, Abuja
Nigerians are becoming increasingly sceptical about President Buhari's fitness to continue to govern the country effectively.
His indefinite medical leave and the economy in recession means the hope and aspirations of the electorate who brought him to power more than two years ago have died.
The uncertainty surrounding Mr Buhari's ability to continue to govern, or stand in elections in 2019, has left a lot of his political associates and supporters in limbo, as campaigning for 2019 begins in earnest a year from now.
Earlier this week, Nigeria's first lady Aisha Buhari launched a cryptic attack, apparently aimed at powerful ruling party politicians suspected of manoeuvring for the presidency or deputy presidency while her husband was ill.
In a Facebook post, Mrs Buhari warned that "hyenas and jackals" would be banished.
The vice-president has been acting in Mr Buhari's place while he is out of the country, but there is no suggestion he is part of any plot against the leader, says the BBC's Naziru Mikailu.
Mrs Buhari's comments came in response to a post from Senator Shehu Sani, who warned that people were "scheming... so that they can be kings".
"Prayers for the absent Lion King has waned," he wrote. "Now the hyenas and the jackals are scheming and talking to each other in whispers; still doubting whether the Lion King will be back or not."
But Mrs Buhari appeared to calm any concerns - suggesting her husband, positioned as the defender of the "weaker animals", was on the mend.
"God has answered the prayers of the weaker animals, the hyenas and jackals will soon be sent out the kingdom."
President Muhammadu Buhari is "recuperating fast" and will return home "very soon", says Nigeria's acting head of state Yemi Osinbajo.

Under plans to go before the cabinet next week, the equivalent of about 367 full time jobs would be cut and 40 libraries closed.
It is part of the council's bid to save £262m by April 2020.
Council leader Jennifer Mein said it was "the most challenging time" for local government.
She added: "We face a combination of relentless central government cuts and rising demand for our services, particularly those serving vulnerable people."
Proposals that will go before the Cabinet on 26 November include:
Since January 2014, 1100 people have left the authority, taking voluntary redundancy.
The proposed job losses are a part of the council's strategy to "balance the budget" by saving £65m over the next two years.
Mrs Mein said: "The scale of the challenge means that we will have to make even more difficult decisions. We will have to reduce or stop services and people will notice the difference."
Deputy leader David Borrow added: "The scale of the savings we have to make means that we will have to use almost all of that money just to balance to books.
"And we know that we will still face a shortfall of £56m in 2018/19."
More than 100 people have signed an online petition to save the Judges Lodgings Museum in Lancaster from potential closure.
Hundreds of jobs could be axed at Lancashire County Council and museums and libraries shut amid "relentless" government cuts, the authority said.

The festival, at Bramham Park, near Leeds, attracts around 80,000 people over the August Bank Holiday weekend.
Attendees often abandon sleeping bags and tents rather than carry them home.
Leeds No Borders, which campaigns on immigration issues, is one of a number of organisations which collects items left behind.
Emily Jennings, from Leeds No Borders, said volunteers had been shocked by the amount and quality of what had been abandoned.
"If we can share just a little with people who have nothing then that is at least one way forward."
Miss Jennings said the equipment they had collected would be sorted and cleaned before being taken to Calais.
Maya Conforti, from L'Auberge Des Migrants in Calais, says the salvaged kit will make a "big difference" at migrant camps.
She said: "There's been torrential rain in the last week which created huge flooding in the Jungle [the nickname of a camp in Calais], the place where the people survive, so we had to distribute tonnes of tents and sleeping bags."
"Conditions are way below international refugee camp standards, there are not enough toilets, the water points are dirty and there's no drainage.
"It's quite awful and there are about 3,500 people who live there. It's a European issue, an international issue."

Camping equipment abandoned by thousands of Leeds festival-goers has been collected to be taken to migrant camps in Calais.

