The president's return was posted on Mr Buhari's official Twitter handle on Friday evening.
He added: "I have interacted with a number of my colleagues and I know there is always a penchant not to go to the public hospital, they always want to go to a private hospital".
Also, there is a doctor-patient relationship.
The health of the president is a sensitive issue in Nigeria following the death in office in 2010 of then president maru Musa Yar'Adua, which followed months of treatment overseas and sparked months of political turmoil.
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In the playoffs, Rinne was pulled from four games - three against Winnipeg and all in Nashville. "That's tough to swallow". The victor of the series will play either the Tampa Bay Lightning or the Washington Capitals for the Stanley Cup.
Speaking on Hard Copy, a Channels Television programme on Friday, the minister said Buhari directed that his son should be treated in Nigeria even when people were clamouring that he should be flown overseas.
President Muhammadu Buhari has declared his intention to seek re-election in the 2019 presidential election. "Take that from me as the Honourable Minister", Adewole said.
Buhari was expected back in the country on Saturday, May 12, 2018, according to a statement issued to the press by his spokesman, Garba Shehu before he travelled.
He had stayed in London for two days last week while returning from Washington, United States, where he met with President Donald Trump. So far, he has failed to state the exact nature of his illness.