 Complete the following phrase:  A product of Bayerns youth system, Müller has represented the German team ever since. He made his first-team breakthrough in the 200910 season after Louis van Gaal was appointed as the main coach; he played almost every game as the club won the league and cup double and reached the Champions League final. Müller scored 23 goals in the 201213 season as Bayern won a historic treble; the league title, cup and 