At the age of 18, Krüger began in the youth department of FC Phönix Schleißheim, a club in the north of Munich, with club football and later moved to FFC Wacker Munichshe switched to the second team at FC Bayern Munich in 2003. After only one season in the Regionalliga Süd, she moved up to the first team for the 2004/05 season. She made her Bundesliga debut on October 24, 2004 in a 4-0 win in the away game against VfL Wolfsburg after being substituted on for Felicia Notbom in the 87th minute.