The Ruhr valley club are stuck in fourth on 50 points, one behind Hoffenheim, who lost 2-1 at Hamburg SV.
League leaders Bayern Munich will be fully focussed on the Der Klassiker against Dortmund despite a ten point lead at the top.
Bayern host Real Madrid in the first leg of their Champions League quarterfinal on Wednesday but Ancelotti provided good news for his team's supporters.
"I can guarantee today that we have not contacted or will contact any of these players".
"The first half was hotly-contested as Dortmund were unsafe up front, they had good chances".
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Lewandowski has scored 13 goals in Bayern's last 10 games in all competitions, including three in a 6-0 victory against Augsburg on April 1.
With the score at only 2-1, Dortmund were in the match as the second half started, but Robben dashed those hopes nearly immediately.
Lewandowski was then brought down by the keeper and the 28-year-old scored from the spot to move one goal ahead of Dortmund's Pierre-Emerick Aubameyang in the Bundesliga scorers' list.
Dortmund, on the other hand, was without Marco Reus, Andre Schuerrle, Julian Weigl, Shinji Kagawa, and Erik Durm, while Lukasz Piszczek stayed on the bench, forcing coach Thomas Tuchel to start 18-year-old defender Felix Passlack.
Bayern were rolling for the first twenty minutes, and it looked like the Bavarians were going to put even more goals past Roman Bürki. "It's a bitter experience".
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Dortmund started with three teenagers in their starting XI but the visitors were overwhelmed at the Allianz Arena with Ribery and Robben both on the scoresheet, to add to a brace from former Dortmund striker Robert Lewandowski, as Carlo Ancelotti's men inched ever closer to a fifth Bundesliga title.
From Bayer Leverkusen's 2002 Champions League runners up, Michael Ballack, Ze Roberto and Lucio ended up in Bavaria, while Miroslav Klose, Tim Borowski joined Bayern from Werder Bremen in 2007 and 2008 respectively.
With an eye on Real Madrid midweek, Bayern took their foot off the gas as they remained in complete control of the match.
"I'd have liked a different result on my return", he told Dortmund's website.
"It will be a tough task". So far this season he has played in 31 of the team's 39 competitive games, contributing five goals and setting up four more.
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