His influence on Berlin Thunder was clearly visible in 2003 as seven of his receivers caught 15 passes or more and Berlin scored 20 times on touchdown passes to rank overall second in the NFL Europa League. When Allen moved on to another NFL Europa team in 2004, the Amsterdam Admirals, he guided Amsterdam's offense to second in the league’s offensive rankings, averaging 316.6 yards per game. Furthermore, two of the top three positions in receiving yards were occupied by Admiral players. In 2005 Amsterdam went one better under Allen's guidance and supervision and established NFL Europa's most potent attack, averaging no less than 357.4 yards and 25.1 points per game.