Borussia Dortmund have become a 'feeder club' of sorts to Bayern Munich over the years, though Robert Lewandowski’s transfer to the Allianz in 2014 might be the one they've ended up ruing the most.
Lewandowski signed a pre-contractual agreement to leave Dortmund as early as November 2013 after running out his deal at Signal Iduna Park, joining Bayern a few months later, and he has since been their standout player.
The Poland international netted 30 goals in his first full season with Bayern, winning consecutive Golden Boot awards from 2017-19 as well as five straight Bundesliga titles.

































