The Ducks also placed center Saku Koivu on injured reserve Wednesday night because of a lower-body injury.
Visnovsky was the NHL's top-scoring defenseman last season with 18 goals and 50 assists, but the Slovak defenseman broke a finger on his right hand late in Anaheim's loss to Nashville on Nov. 11. He missed 13 games, but his absence also allowed another injured finger on his left hand to heal.
Koivu was hurt in Anaheim's loss at St. Louis last week, apparently aggravating his frequently injured groin. The Ducks haven't set a timetable for his return.