Borussia Dortmund head coach Lucien Favre admitted it will be “brutally difficult” to stop Bayern Munich retaining their Bundesliga title after Bayern beat Dortmund on Tuesday.
Joshua Kimmich’s wonderful chip from 20 yards just before half-time was the only goal at Signal Iduna Park.
Bayern are seven points clear of their second-placed opponents with six matches to go.
“Seven points in six games – it will be very, very difficult,” said Favre.
Bayern are aiming for their eighth successive Bundesliga title but boss Hansi Flick insisted there is still a lot of work to do.
“I don’t live in the future, the here and now is important,” he said.
“We wanted to win and take a big step forward – we did that. We were focused, decisive and courageous at times. I’m satisfied with my team.”
Kimmich’s goal came after both sides had efforts cleared off the line.
Dortmund brought on England forward Jadon Sancho in the second half, but he could not inspire a fightback from his side.
Robert Lewandowski nearly doubled Bayern’s advantage late on but shot against the post. Minutes later, he and the rest of the Bayern players were celebrating what could prove to be a big three points in the title race.
Before the game the build-up focused on Lewandowski and Dortmund’s Erling Braut Haaland, with both strikers having scored 41 goals in 35 domestic games this season – putting them level as top goalscorers in Europe.
Haaland nearly got his 42nd domestic goal of the campaign inside the opening 35 seconds when he shot through the legs of Bayern goalkeeper Manuel Neuer – making his 400th Bundesliga appearance – but Jerome Boateng was well placed to hack the ball off the line.
Dortmund then had the ball in the net when Thorgan Hazard headed in, but an offside earlier in the move ruled the effort out.
Bayern got more involved in the game and had a number of chances. Serge Gnabry had an attempt backheeled off the line by the retreating Lukasz Piszczek before Kingsley Coman and Leon Goretzka were both denied by home goalkeeper Roman Burki.
However, Burki will be unhappy that he could not keep out Kimmich’s lofted effort just before the break as the Switzerland international got his hand to the ball but it still went in.
Dortmund, despite the introduction of Sancho at half-time, struggled to create clear-cut chances in the second half and Haaland was replaced by Giovanni Reyna with 18 minutes remaining.
But the home side had a chance to grab an equaliser when Raphael Guerreiro had a free-kick just outside the penalty area but could only shoot straight at Neuer. Mahmoud Dahoud also had a late effort saved by Neuer on a frustrating afternoon for the hosts.