Bayern Munich sporting director Matthias Sammer says the Bavarians are missing "two or three per cent" and called upon the team's leaders to step up their efforts on the pitch.
Jupp Heynckes' side have dominated the Bundesliga this season and could win the league this weekend if they beat Hamburg and Borussia Dortmund fail to defeat Stuttgart, while remaining firmly in the hunt for the Champions League and DFB-Pokal.
However, Sammer feels Bayern are not operating at the same level they did earlier in the season, and has urged them to get back to their usual best.
"It's impossible to play at a very high level for an entire season, but we have been missing two or three per cent ever since the DFB-Pokal win over Borussia Dortmund," Sammer was quoted as saying by Bild.
"We have to improve three things. The leaders in the team have to step up again and lead their team-mates the way. Plus we have to act disciplined and well organised again off the ball. And we have to play at a higher pace and be more creative in possession.
"Nobody can be talking about fatigue at this point. Everybody should be in top shape because of Jupp Heynckes' rotation system.
"The big lead in the Bundesliga table will not help us in the other competitions. We have to get everything that could distract us out of our systems."