The 42-year-old signed a three-year deal with the Bavarians back in January and replaces Jupp Heynckes, who lifted the treble with the club last term.
Guardiola has now started work as Bayern prepare for the 2013-14 campaign and Lahm believes that a period of adaptation is to be expected.
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"He is communicating all the time and does a lot of talking. He wants us to understand him as soon as possible. Plenty of things will change.
"I have already experienced a lot of coach swaps, though, so this is nothing extraordinary for me. It's all part of the job.
"It's just like when someone gets another boss in any other company. Different things all of a sudden become more important. It's too soon to draw any conclusions, though."
Guardiola's first official game in charge of Bayern will be the German Super Cup clash against Borussia Dortmund on July 27.