The tennis and basketball stars said in videos posted on social media that they are supporting a Red Cross fundraising effort to help with the public health crisis.
Nadal and Gasol say they have made donations and urged others to follow their lead. Former Spain goalkeeper Iker Casillas quickly said he would pitch in.
Nadal says “I believe that we are who we are in large part thanks to your support and now we have to be there for you.”
Spain has 56,188 infections and more than 4,000 fatalities from the virus.