The reigning Bundesliga champions have conceded six goals in their last two league games, and only Hoffenheim and Stuttgart have conceded more goals up to now.
"We have conceded the third-most goals in the league. This is a terrible statistic. We will approach this problem, and we have a lot of work to do," Klopp said at a press conference.
|TIME FOR A THIRD BUNDESLIGA?|
|5/1||Borussia Dortmund are now 5/1 with William Hill to recover and claim a third Bundesliga title|
"And if we do that we won't make it so easy for our opponents, even for well-playing ones."
Dortmund currently sit fifth in the Bundesliga with eight points from five games.