@mikhalkov
Heidenheim head into the weekend as the surprise leaders in Germany, having scored six goals in their opening two Bundesliga games and conceded none.
The club were playing in the fourth tier 15 years ago but finished eighth in their debut Bundesliga season last term to earn a spot in Europe, where they will face Chelsea in the Conference League.
After starting the current campaign with victories over St Pauli and Augsburg, they visit Borussia Dortmund on Friday evening, with the Champions League runners-up also unbeaten and yet to concede a goal this term.
"We will just try to keep the momentum going and be completely present on Friday," said Paul Wanner, the 18-year-old midfielder who has impressed with two goals already for Heidenheim this season on loan from Bayern Munich.
Vincent Kompany's Bayern have also won both their opening games and visit newly-promoted Holstein Kiel on Saturday (17:30 BST).