Linas Kleiza underwent arthroscopic surgery on Wednesday by Dr. J. Richard Steadman in Vail, Colo., "to address both a meniscal tear and chondral defect of his right knee."
A microfracture procedure was performed on Kleiza's knee.
Kleiza is expected to be sidelined for nine months to a year.
Toronto signed Kleiza this past offseason as a free agent.