The Bavarians have now failed to win any of their last three games on the road in all competitions and have fallen seven points behind leaders Borussia Dortmund in the Bundesliga standings.
Consequently, while Nerlinger feels that Bayern were unlucky to lose at the BayArena, he believes that they have some serious issues to address before they can start thinking about winning the league again.
“We’re deeply disappointed,” the Bavarians' general manager is quoted as saying by his club’s official website.
“In the first half, we made enough chances for three games. We have to take one of those chances, it would have completely changed the course of the match.
“We were too impatient in the second half; we wanted to win it by force. We lost our shape and gave Leverkusen space to counterattack – which they did twice.
“There can be no complaints today about our determination and desire. [But] today we won’t be talking about winning the league.
“I’m not writing off the title, but it’s not something which need concern us now. Somehow, we have to get a grip on our weakness away from home.”
Bayern's next Bundesliga outing comes against Hoffenheim at the Allianz Arena next Saturday.
How do you stay up to date with football when on the move? With http://m.goal.com – your best source for mobile coverage of the beautiful game.