A French news agency reported that a boy's body was found by bathers in the water south of Porquerolles at around 5pm.
Toulon prosecutor Xavier Tarabeux told Agence France Presse (AFP): "The body matches that of the young boy who went missing on Saturday."
He said the physical appearance matched as well as the clothes.
The agency reported that the body was found by Langoustier bay to the south of the island, not far from where Pierre's bike was discovered.
More top news
Rather cloudy but mainly dry with some brightness tomorrow.
Frost free tonight then mainly dry and bright tomorrow.
Sutty from the Pets as Therapy charity is one popular visitor on the Children's wards, helping brighten up the day for poorly patients.