The Teatro alla Scala has announced a cast change for “Fedora.”

The company said that due to illness Sonya Yoncheva will not sing the performance on Oct. 30. As a result, Chiara Isotton will take over the title role.

Isotton has performed at the Teatro alla  Scala in a production of “Macbeth” and is set to sing the “Le Amore dei Tre Rei” at the Milan house. She is also set to perform in Piacenza and Venice.

She joins a cast that includes Fabio Sartori, Serena Gamberoni, and George Petean. Marco Armiliato conducts the production by Mario Martone.

Yoncheva returns for the final performance on Nov. 3. She also sings the title role later this year at the Metropolitan Opera.