Bielefeld climbed out of the bottom three after a 79th minute goal from Dane Jonas Kamper earned the hosts the three points.

They leaped over Dortmund on goal difference, as the 2002 champions went a fifth straight game without a win and suffered a seventh defeat in their last nine.

Dortmund have only seven games left to save their season and coach Thomas Doll, who took over from Juergen Roeber just over two weeks ago, is seriously worried.

"What I saw tonight did not please me one bit. We didn't press the ball enough and didn't play with enough rhythm," said Doll, who was sacked by Hamburg in February as they sat bottom of the league.

"We are in the relegation zone now and the following week will be very tough, but we can still get out of this situation."