Bayerrn Munich skipper Philipp Lahm has warned Franck Ribery over his behaviour after the Frenchman appeared to elbow Borussia Dortmund defender Felix Passlack in this weekend's DFL-Supercup encounter.
Ribery escaped with a yellow card following the first-half incident, but Lahm has told the 33-year-old his actions were not acceptable.
"I have told him that he should keep his hands off his opponents," Lahm said at a news conference.
"I think he understands what I mean, but you cannot just change his character altogether, that is rather difficult.
"I just hope that things like this do not happen again in the future, but I obviously cannot guarantee anything."
It is not the first time Ribery has been publicly reprimanded this season, with Carlo Ancelotti also warning him after a similar incident in the friendly against Inter, while chairman Karl-Heinz Rummenigge told him off after he criticised former Bayern coach Pep Guardiola.