"He has undergone a series of tests which appear to point to severe exhaustion," the FWA said in a statement, reports Xinhua news agency.
"He is on fluids while doctors monitor his recovery. Thankfully there is no suggestion of anything more serious."
Pele has been stricken by a series of health ailments in recent years, including kidney and prostate problems.
In a celebrated 21-year career, Pele scored 1,281 goals in 1,363 matches and won three World Cups, the only player to achieve the feat.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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