"I'm very happy to have extended my contract with Dortmund. I work with great enthusiasm and commitment to this club," Doll told the club's official website.

"I and the board want to move this club forward. Dortmund and their fans deserve all the best."

Doll took charge of Dortmund in March 2007 after being sacked by Hamburg SV one month earlier.

The 41-year-old coach helped Dortmund survive relegation last season.