Iserlohner EC joined the Deutsche Eishockey Liga in 2000 and adopted the name Iserlohn Roosters. A GmbH, which serves to administer the finances and the business organisation, was created for the professional team. The GmbH was named the Iserlohn Roosters GmbH. All junior teams were still under the control of the IEC. The Roosters continually had the lowest budget of all DEL teams, and the media often referred to them as an underdog team. In their first two seasons, the Roosters placed 15th and 12th.