Borussia Dortmund CEO Hans-Joachim Watzke has warned the club's players they could face consequences for a poor start to the season, and has demanded "blood, sweat and tears" to turn the situation around.
Dortmund blew a two-goal half-time lead to draw 2-2 at promoted Paderborn on Saturday, dropping into the relegation zone with only 11 points from 12 games.
The 2013 Champions League finalists face an uphill task in their remaining 22 Bundesliga games to return to Europe in the 2015-2016 season.
Borussia Dortmund midfielder Ilkay Gundogan has rejected claims he is seeking a switch into Premier League.
The Manchester Evening News published quotes from Gundogan in which he appeared to suggest he was keen to move to England amid reported interest from Manchester United.
However, he told Dortmund newspaper Ruhr Nachrichten on Tuesday: "I have never talked to that paper, and I am annoyed by the discussion.
"The only explanation I have is that an interview I gave to a Turkish TV network [TRT]...