Pele was taken to hospital on Wednesday morning after suffering a crisis of tetany in his hotel room in Paris.
The 78-year-old felt ill overnight and had to be admitted as a precautionary measure, but his situation is not considered to be life-threating.
According to the radio station RMC Sport, Pele came down with high fever after his meeting with Paris Saint-Germainforward Kylian Mbappe.
The three-time World Cup winner and the 20-year-old attended an event, which was part of an advertising campaign in the French capital.
The sponsor had planned the event for last autumn, but a health problem prevented the Brazilian from travelling abroad.