Lieberson was to sing Mahler's Das Lied von der Erde with the MET Orchestra, led by James Levine, at Carnegie Hall on January 23. Anne Sofie von Otter, who had previously been scheduled to sing with the orchestra on January 30 at Carnegie, will step in for Lieberson.
Ben Heppner will sing the tenor solo sections of Das Lied as scheduled, and the rest of the program remains the same: Weber's Overture to Oberon and Elliott Carter's Variations for Orchestra.
A new soloist for the January 30 concert has not yet been named. Von Otter was herself a replacement for baritone Thomas Quasthoff, who withdrew because of a scheduling conflict.
It was not immediately clear how serious Lieberson's injury is or whether it will force her to miss other engagements.