Bourssia Dortmund Hosts Farewell Match For Lukasz Piszczek and Jakub BlaszczykowskiGetty Images Sport

'That's why he's the boss' - Borussia Dortmund reveal Jurgen Klopp's two key tactics as ex-Liverpool boss returns to takes charge of team

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  • Klopp back in dugout for special match
  • German's tactics on show in dressing room
  • 'Vibes and friendship' key for his team
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