Pele was taken to hospital in Paris as a precaution after falling ill following a meeting with Kylian Mbappe, according to reports.
French radio station RMC Sport said the 78-year-old had a "crisis of tetany" (involuntary muscle cramps) as well as a fever, which resulted in him being kept in for observation.
Press Association Sport has approached representatives of the Brazilian three-time World Cup winner for comment.
Pele has struggled with health issues in recent years, pictured using a cane to aid his walking due to problematic hips and knees as well as suffering from a serious urinary tract infection.
The former striker pulled out of the opening ceremony of the 2016 Olympic Games in Rio de Janeiro due to unspecified health reasons.
Pele arrived at the draw for the 2018 World Cup using a wheelchair. During January last year, he was also unable to attend a tribute dinner held in his honour by the Football Writers' Association in London.
The Brazilian, regarded as the world's greatest player, had been able to travel to France earlier this week to meet with Mbappe as part of his ambassador role for a Swiss luxury watch brand.
Mbappe was one of the stars of Les Bleus' 2018 success in Russia, and followed Pele in becoming the second teenager to score in a World Cup final as Croatia were beaten 4-2.
Pele, part of the 1970 Brazil World Cup winning squad, feels there is yet more to come from the 20-year-old Paris St Germain forward.
"He is really fast, has the ability to think quickly, change his gesture at the last minute. This is something which challenges us all," Pele said to RMC Sport on Tuesday.
"Each player has his speciality, his own characteristic and he is very fast in his decision-making, it is one of his strong points."
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Brazil football legend Pele is back in hospital again two months after he had prostate surgery.
The 74-year-old is reportedly suffering from a trapped nerve and has had surgery on his back at the Albert Einstein hospital in Sao Paulo.
Local media are reporting that he is expected to leave hospital on Monday.
Pele, who was named Fifa's Player of the Century, scored a world record total of 1,281 goals during his 21-year career, including 77 for Brazil.
Brazilian football legend Pele has left hospital after undergoing prostate surgery.
According to reports, tests have revealed the 74-year-old has a benign condition.
It is the second time the former footballer has been hospitalised in six months.
Pele believes England are counting the cost of their player pool being concentrated in the Premier League rather than cast across the world.
While Pele's native Brazil can call on players from most corners of the globe, elite English footballers are habitually stay-at-home professionals, with few exceptions in recent years.
It means England boss Roy Hodgson picks his side from players who have limited experience of overseas conditions, whether in terms of playing styles, climatic conditions or cultures.
Speaking to BBC Radio 5 Live, Pele said:
The team is good. But to talk about the England team - it is very difficult you see when the England team plays outside (England).
The players who play in England, they don't have experience of playing abroad. There is not a player who used to play in Japan, or play in Africa, or play in South America.
I think this is one of the reasons when you have the big competition, the players they have a problem. I think this could be one of the problems.
England face Lithuania in Euro 2016 qualifying at Wembley on Friday, before tackling Italy four days later in a Turin friendly. Both games are live on ITV.
Pele has been impressed by compatriot Philippe Coutinho and is looking forward to seeing the Liverpool man in action against Manchester United.
The talented 22-year-old was seen as a bit of a gamble when the Reds forked out £8.5million to bring him over from Inter Milan.
That deal now looks like a bargain, though, as Coutinho has been one of the stars of the Premier League season.
Such form has seen the midfielder work his way back into the Brazil set-up and led to praise from Pele, who will be at Liverpool's derby encounter with United on Sunday.
Oh yes (I like Coutinho) - no doubt, no doubt. He is an excellent player and intelligent, but we have a lot of individuals in Brazil. Unfortunately we cannot play with all the players we have.