The former attacker complained of nausea, and after being treated by his personal physician, was advised to seek a second opinion, but is stable and now said to be recovering
The 58-year-old first started feeling unwell on Thursday night, and after being treated by his personal physician it was decided that he should get a second opinion on Friday.
The former Japan coach underwent a number of medical examinations, and is now waiting on the results. Despite this, Dr Peter Cirillo remained relatively upbeat.
"Given the clinical picture of fever, nausea, severe headache and myalgia, Zico is in the hospital for examinations aiming for definitive diagnosis. At the moment [he] is well, ready and waiting for test results," the health professional stated to the press.
The playmaker was capped 72 times for his nation, scoring 52 goals, and is widely regarded as one of the game's greatest ever players.