The BVB skipper has stressed that the pressure is on the Bavarians and is optimistic about his side's chances of causing an upset on May 25
The midfielder has not forgotten about BVB's 5-2 cup final win last term and believes Dortmund have a good chance to beat Bayern again later this month.
"Bayern wanted to blow us out of the water in last year's DFB-Pokal final, too. That didn't work out too well for them," Kehl told Der Westen.
"They have not been able to beat us in the Bundesliga this season either. They will be quite nervous about what could happen in London.
"Their season will be ruined if they do not win the Champions League final.
"We have earned a lot of respect in the past few years and I think that we have a good chance to beat Bayern in London."
The Champions League final will take place at Wembley on May 25.