Cavalli was scratched from his scheduled start against the Rays on Friday due to an illness.
Cavalli was penciled in to start Friday's series opener but instead won't be available due to food poisoning, per Andrew Golden of TheBanner.com. The Nationals are hopeful Cavalli will be ready to start Saturday. PJ Poulin will start in Cavalli's place with Miles Mikolas set to follow in the bulk role.