Swansea keeper Tremmel grew up idolising German legend Kahn
Tremmel came through the youth system at Bayern.
"Oliver was a hero growing up and it was great to play against him in the Bundesliga," he said.
"He definitely left his mark on the goalkeeping landscape.
"There are a lot of things I learnt from him, like how he keeps his concentration for the full 90 minutes and then stops a shot in the final seconds of a game."