As Harry Kane and Niclas Füllkrug prepare to face Borussia Dortmund and Bayern Munich for the first time with their respective new clubs, bundesliga.com looks back on the players to have made a real impact on their Klassiker debuts.
Bayern Munich and Bayer Leverkusen have regularly found themselves at odds competing against each other for silverware – as they will do once again on Sunday in a top-of-the-table clash – but there are plenty of players with split allegiances come the Matchday 8 encounter.