Peru striker Paolo Guerrero, who plays for Brazilian side Corinthians, has been diagnosed with dengue fever.
A spokesman for Sao Luiz hospital in Sao Paolo confirmed the 31-year-old has the mosquito-borne tropical disease but said he was "doing well".
Guerrero missed his side's league match with AA Pronte Preta on Saturday because of a fever and was sent to hospital for tests.
He is Corinthians' top scorer and could be out for two weeks.
Guerrero, who has played for Bayern Munich and Hamburg, posted a picture from hospital on Instagram on Tuesday, saying: "I hope that my recovery is speedy."
The forward, who has six goals this season, will miss the Sao Paolo state league semi-final with Palmeiras on 19 April.
He will also likely be sidelined for the final two matches in the group stage of the Copa Libertadores, the South American club competition.
|Dengue fever (from the World Health Organisation)|
|The virus, found in in tropical and sub-tropical climates, is transmitted to humans through the bites of infected female mosquitoes||Symptoms last between two and seven days and include a high fever, severe headache, pain behind the eyes, muscle and joint pains, nausea, vomiting, swollen glands or rash.|
|Causes flu-like illness, and occasionally develops into a potentially lethal complication called severe dengue. There is no specific treatment for dengue.||In 2013, there were 2.35 million cases of dengue reported in the Americas|