Nielsen will end his playing career following the conclusion of the 2022 IIHF World Championship.
Nielsen spent the 2021-22 season playing in the DEL for the Berlin Eisbaren for which he registered 12 goals and 15 assists in 33 games. Over the course of his 15-year NHL career, the veteran logged 925 games for the Islanders and Red Wings but saw action in just 24 postseason contests.