Jean-Joseph Mukendi wa Mulumba was the acting head of President Tshisekedi’s legal advisory council.
He is likely to have contracted the respiratory illness during his trip to France for a medical check-up.
Mr Mulumba has been a key figure in DR Congo opposition politics and in human rights circles.
And in Nigeria, A senior government source has told the BBC that President Muhammadu Buhari’s chief of staff has tested positive for coronavirus.
There’s been no official comment.
Meanwhile, An eight-month-old baby in Uganda, whose father recently travelled back from Kenya’s western city of Kisumu has tested positive for coronavirus.
The baby girl is one of five new cases detected in Uganda.
According to health officials, she is being treated at Iganga hospital some 100km (62 miles) east of the capital, Kampala.