Thamsanqa Jantjie sparked outrage for his translations of eulogies, including by US President Barack Obama and Mandela's grandchildren, at the service last week, with sign language experts saying his signing amounted to little more than "flapping his arms around" and "just making funny gestures."
On Thursday the Star newspaper said Jantjie's wife Siziwe had taken her husband for a check-up to a psychiatric hospital near Johannesburg on Tuesday, which suggested he be admitted immediately.
Jantjie had been scheduled for a check-up at the Sterkfontein Psychiatric Hospital in Krugersdorp, west of Johannesburg, on December 10.
But the appointment was moved after he was offered the job to sign at the memorial which took place the same day, the newspaper reported.
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Jantjie has claimed that he is a qualified signer but that his performance was down to a sudden attack of schizophrenia, for which he takes medication.
"I saw angels falling on the stadium. I heard voices and lost concentration," he has said.
Mandela's memorial was attended by nearly 100 sitting and former heads of state or government.
The government apologised to the deaf community following the scandal.