A product of Bayern's youth system, Müller has represented the German team ever since. He made his first-team breakthrough in the 2009–10 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 2012–13 season as Bayern won a historic treble; the league title, cup and Champions League. He broke the Bundesliga record for assists by providing 21 in a season (a record in the top five leagues jointly held with Lionel Messi in La Liga) and scored 14 goals as Bayern won a second treble in the 2019–20 season.