Brazil great Socrates has been readmitted to hospital in Sao Paulo over a stomach haemorrhage suffered two weeks ago.
Local media speculated on Tuesday that he had been put in intensive care and that his condition was serious.
"For the time being, we cannot say anything about the state of his health," a spokesperson for the Albert Einstein Hospital told AFP, after confirming Socrates' presence at the facility.
The 57-year-old had previously been taken to intensive care on August 20 after being diagnosed with serious gastrointestinal bleeding.
Socrates captained Brazil at the 1982 and 1986 World Cups and is considered a legend at Sao Paulo club Corinthians.
As well as starring for Corinthians, he also played for Botafogo, Flamengo and Santos, along with Italian side Fiorentina.