bundesliga.com rounds up all the must-have tidbits ahead of the clash in the Bosnian and Herzegovinan capital...
The Foals will be without two key players in south-eastern Europe. Forward Max Kruse ruled out due to a pelvic conplaint, while World Cup winner Christoph Kramer will not make the trip as "he hasn’t been back in training long enough,” according to coach Lucien Favre. All other members of the first-team squad are available for selection, though.
Gladbach are favourites to go through, even if the teams have never met. Sarajevo went top of the Bosnian Premier League on seven points at the weekend following a 1-1 draw with FK Velez, extending their unbeaten start to the domestic campaign, while Gladbach beat FC Homburg 3-1 in the DFB Cup first round on Saturday.
In the absence of Kruse, 21-year-old Swedish striker Branimir Hrgota could well be asked to lead the line again, as he did by scoring a brace against Homburg. "He had two chances and took them both clinically," said Favre. "He's got unbelievable potential."
"I'm really looking forward to making my debut in European football," said summer signing Andre Hahn. "For me there's nothing better than playing in front of a fiery crowd. Almost the whole stadium will be against us but we've got a good team who know how to look after themselves."