Bayern Munich take on Borussia Dortmund in the German Super Cup final on Sunday - and this season's first edition of "Der Klassiker" comes with a dose of soap-opera-style drama that football so often seems to throw up.

Bayern's new coach, Carlo Ancelotti, will be looking to lay down a marker for the season by claiming a first victory in the derby, but his first competitive appearance in the dugout is likely to be the "B" story in this latest instalment of the Bayern-Dortmund saga.

The "A" story concerns two German World Cup winners who this summer swapped one team for the other - and have caused no end of online consternation and hand-wringing for doing so.

Mats Hummels went from Dortmund to Bayern, Mario Goetze from Bayern to Dortmund. The two will now face off against each other as they make their debuts for their new clubs.

More accurately, each will be making his second debut. Hummels came through the ranks at Bayern and made one league appearance before moving to Dortmund, while Goetze made his name at Dortmund and then moved to Bavaria. There he endured a frustrating time, flitting in and out of the first team.

Each will be hoping for a warm reception from his new club's supporters - but how will those of their former club react? "Football is a very emotional matter," Hummels said. "There will definitely be some people that won't give me a good reception."

While Hummels is realistic about being harangued by those who had formerly laid palm leaves at his feet, he admits the experience will be unsettling. "It will be a strange feeling for me," he told Sky Sports News.

The match will be played at Dortmund's Signal Iduna Park, home of the fiercely partisan "Gelbe Wand", the yellow wall composed of almost 25,000 Dortmund die-hards.

Hummels knows first-hand what an intimidating atmosphere those fans can create for a returning former favourite - he was playing for Dortmund when Mario Goetze made his first appearance at the Signal Iduna in Bayern colours and the home fans' boos and whistles reached a deafening crescendo.

Thomas Mueller, Hummels's international team-mate and new Bayern colleague, hopes it will not come to that. "Jeering would be complete nonsense, in my view," he said.

"He has put his body on the line for I don't know how many years at Dortmund. As a leading figure he really has brought the success back (to the club). You can sometimes show a little gratitude."

While unlikely to be applauded onto the pitch by the Bayern fans, Goetze will likely have the easier ride of the two players - he was once a Dortmund fans' favourite, after all.

Yet heated discussions have taken place on Dortmund fans' forums since his return was announced this summer, with some apparently reluctant to forgive him for leaving the club for their arch rivals in 2013.

"Of course it's something you think about," Goetze replied when asked if he was worried he might be jeered. "I don't know how it'll be, but I hope that everything goes positively - so positively that we can win the game."

The speculation about Goetze's reception could all be moot - Dortmund coach Thomas Tuchel has indicated that he may look to rest those players who started their pre-season training late, of which Goetze is one.

Tuchel's counterpart Ancelotti, meanwhile, will be looking to get his Bayern career off to its best possible start by adding to his Super Cup haul.

The Italian won the Italian Super Cup with AC Milan in 2004, the English Community Shield with Chelsea in 2009, and has three European Super Cups to his name - two with Milan and one with Real Madrid.

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