Rafael Nadal has raised doubts about his participation in this year's Tokyo Olympics amid the COVID-19 pandemic, saying on Tuesday that he has to be flexible and cannot give a clear answer until he organizes his schedule for the year.

Japan has extended a state of emergency in Tokyo and three other areas until the end of May as the country battles a surge in COVID-19 cases, raising new questions about whether the rescheduled July 23-Aug. 8 games should go ahead.

Nadal, who won a singles gold in Beijing 2008 and added a doubles title in Rio de Janeiro eight years later partnering with Marc Lopez, said that he is yet to firm up his plans on traveling to Tokyo.