Guardiola is credited with having an impact on Rangnick but played down those suggestions as he lavished praise on the United boss.
However, Guardiola's comments may prompt a rethink from the United hierarchy.
"My impact on these managers - Jurgen, Thomas and Ralf - is zero," Guardiola said.
"They set it for themselves. I learn from German culture and football a lot.
"I was a guy who got many things in this incredible country, they show how good they are, Nagelsmann at Munich.
"The manager for Southampton is exceptional, Ralf as well. Managers from Germany are a top level, I learn a lot from them."
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