The Ducks announced the signing a few minutes after Andersen's 26-save performance in a 2-1 road victory against the Ottawa Senators.
Andersen, 24, made his NHL debut Oct. 20 against the Dallas Stars. He entered the game in relief of Jonas Hiller to start the second period and stopped all 24 shots he faced as the Ducks rallied for a 6-3 victory. The 6-foot-4, 230-pound goaltender was recalled by Anaheim on Oct. 18 after beginning the season with a 2-0-0 record, one shutout, a 0.96 goals-against average and a save percentage of .971 in two games with the Norfolk Admirals of the American Hockey League.
The Ducks chose Andersen, a native of Herning, Denmark, in the third round (No. 87) in the 2012 NHL Draft. He is 26-18-1 in 49 AHL games with five shutouts, a 2.14 GAA and .931 save percentage.