Former Tottenham and Newcastle footballer was playing in a match
Former Premier League star David Ginola has tweeted that he is having tests done after playing football "in the midday sun".
Earlier reports suggested he had suffered a cardiac arrest after falling ill in Mandelieu on the French Riviera.
He was apparently transferred to the Princess Grace Hospital in Monaco.
He later tweeted: "Footy match in the midday sun, not very clever.
"Now having some tests done.
"Whoever voted for a World Cup in Qatar in the summer?"
Footy match in the midday sun, not very clever. Now having some tests done. Whoever voted for a World Cup in Qatar in the summer?— David Ginola (@teamginola) May 19, 2016
During a seven-year spell in the Premier League he played for Newcastle, Tottenham, Aston Villa and Everton before retiring in 2002.
He won 17 caps for France between 1990 and 1995, scoring three goals.
Since retiring he has become a media pundit.
In January 2015 he announced his intention to run for the presidency of FIFA.
But he withdrew shortly afterwards, having failed to get the backing of five football associations.