Bayern Munich sporting director Matthias Sammer insists that Pep Guardiola "is not a magician" and will need time to adapt to his new surroundings.
Expectations at the Bavarian club are sky-high following the 42-year-old's arrival this summer on the back of the club's treble-winning campaign of 2012-13.
But Sammer feels people cannot expect Guardiola to replicate such success straight away and requires time if he is to build a winning legacy at the Allianz Arena.
"Jupp Heynckes did not win anything in his first year at Bayern Munich. Jupp is a superb trainer, no doubt about that, but he needed a bit of time as well," Sammer told Sky.
"Now everybody says Pep Guardiola doesn't need any time to adapt and this is something I cannot understand.
"We have a new coach, who will need time to get used to his players, tactical formation and the board of directors.
"He is not a magician. He works hard, talks a lot with the players and does so in German. The fact that there's a big hype surrounding him and that he won everything he could win at Barcelona counts for nothing now."
Guardiola guided Bayern to a 3-1 win over Borussia Monchengladbach in his Bundesliga debut on Friday.