Borussia Dortmund coach Jurgen Klopp has admitted that he is unsure who will play in attack against Borussia Monchengladbach on Sunday.

Jakub Blaszczykowski is a doubt with injury and both strikers Robert Lewandowski and Julian Schieber are missing through suspension.

Klopp said that he would make his players alert to Gladbach's threat on the counter and their ability from set pieces.

"I'm sure [Gladbach coach] Lucien Favre's neither expecting Mats Hummels nor Neven Subotic to play up front," he told the club's official website.

"His teams defend in a certain way. They drop deeper and try to catch you on the counter-attack. And their set plays are a real weapon; you can't hand a player like Juan Arango too many opportunities."

Dortmund look likely to lose their Bundesliga crown to Bayern Munich as they are 15 points behind them.