He previously played in the National Hockey League (NHL) with the New Jersey Devils and the Florida Panthers.

In the 1998 Entry Draft, Berglund became the New Jersey Devils's third choice, being chosen in the second round as the 37th overall pick.

On 1 March 2004, he and teammate Victor Uchevatov were traded to the Florida Panthers in exchange for Viktor Kozlov.

He enjoyed a 5-year stint in the NLA, before returning again to his original club in Färjestad on a 4-year contract on April 21, 2010.

This biographical article relating to a Swedish ice hockey winger is a stub.