The 31-year-old goalkeeper feels the Signal Iduna Park outfit can make up enough ground on the rampaging Bavarian giants to retain their top-flight crown
The 2010-11 champions have improved after an indifferent start to this campaign whilst Jupp Heynckes' men have powered their way to the summit of the standings.
Despite a three point difference between the two sides ahead of this weekend's fixtures, the 31-year-old stopper feels the Signal Iduna outfit have what it takes to overtake the Bavarians.
"Sure, Bayern have an exceptional team with strong individual players," the former Kaiserslautern number one told Bild.
"They have not already been presented the championship trophy. The season is still long, a lot can happen. We are as good as last year, just look at us.
"I have said for weeks that after the game against Bayern (Ed. note: November 19) we may well be tied. Back then it was considered a huge undertaking. Now you can see that it was not so presumptuous," he concluded.
Dortmund have a tricky away fixture against Stuttgart on Saturday, whilst Bayern host Bavarian local rivals Nurnberg at the Allianz Arena.