After playing four years with the University of Minnesota, Millen moved to Europe for the first time, where he played in the Swiss Nationalliga A from 1987 to 1989 along with Dale McCourt, wearing the jersey of HC Ambri-Piotta.
Following his four-year stint at the University of Minnesota, Millen ventured to Europe for the first time and played in the Swiss Nationalliga A from 1987 to 1989. He was joined by Dale McCourt at HC Ambri-Piotta, wearing their jersey.