The academy closed to the public on Saturday in a bid to avoid outside infection, meaning players and staff have been forced to remain inside.
“I would like to take this opportunity to put the parents’ minds at rest and to tell you all that your children are being very well looked after by a great team that is giving their all every single minute to take care of their health,” Nadal wrote in an open letter on the academy website.
“I would also like to encourage you to stay at home. These are difficult times but together we will come through them.”
Nadal was born and raised on the Spanish island of Mallorca, and the academy, which is part of a high-performance tennis centre, is located in his home town of Manacor.
Players of 42 different nationalities reside at the academy throughout the year, and Nadal attested to the “complicated times” brought about by the virus.
Only China, Italy and Iran have more. It was announced earlier this week that Nadal’s defence of his French Open title will be put on hold until September as the tournament was postponed from its usual May start date.
All professional tennis competitions have been postponed until June 7 amid the virus with men’s and women’s rankings frozen until further notice.