Oakland, CA -- (Sports Network) - Golden State Warriors guard Monta Ellis underwent successful surgery Wednesday to repair a torn deltoid ligament in his left ankle and will be sidelined a minimum of three-plus months.

Ellis suffered a Grade 3 high ankle sprain, the torn deltoid ligament and a syndesmosis disruption of his left ankle last Thursday while working out in his hometown of Jackson, Mississippi.

Ellis, 22, is expected to have the ankle immobilized for approximately six weeks and spend the following six weeks undergoing off-court rehabilitation.

Based on his progress, the 6-foot-3 guard will be cleared to begin on-court rehabilitation after the successful conclusion of the first two steps in the process.

A potential return date will not be estimated until the initial 12-week period is completed.

A three-year NBA veteran, Ellis averaged a career-high 20.2 points last season.