Erling Haaland is "almost obsessed with success" but comparing him with Robert Lewandowski is pointless, according to Michael Zorc.
Two of Europe's most feared strikers go head to head on Saturday when Borussia Dortmund host Bayern Munich in the Bundesliga.
Lewandowski was the top scorer in Europe's top-five leagues last season, hitting 51 goals to propel Bayern to a treble triumph, and he set a Bundesliga record by scoring 10 goals in the first five matchdays of 2020-21.
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Haaland, meanwhile, has managed five goals in as many Bundesliga appearances this term from a total of 15 shots.