Vincent said that Domingo will sing the role as scheduled with Hamburg Opera in 2007.

Vincent told PlaybillArts that Domingo was forced to cancel the April 23 gala performance in Zurich due to his recent bout of tracheitis. "He was silent for three months, which is the longest period he stopped singing in a 40-year career. He is following his doctor's advice not to overdo it."

Domingo was to appear in the closing night of the production, which starts on April 13 with Jonas Kaufmann in the title role.

Domingo developed an inflamed throat during a Los Angeles Opera production of Parsifal in December and then missed a series of performances of Cyrano de Bergerac and Samson et Dalila at the Metropolitan Opera in January and February. He also withdrew from a Robert Wilson production of Die Walk‹re in April in Paris, citing insufficient rehearsal time.

His next Wagner performance will be as Siegmund in Die Walk‹re in Copenhagen on April 7. Other upcoming appearances include the title role in Cyrano de Bergerac at London's Royal Opera House May 8-27.