UEFA have opened disciplinary proceedings against Bayern Munich after a banner related to Kosovo was displayed at the stadium during Wednesday's Champions League game against Arsenal.
European football's governing body have said they will also look into a small banner shown during the last-16 second leg tie which appeared to insult Arsenal.
The second banner carried the slogan 'Gay Gunners' and appeared to depict Mesut Ozil - the German international playmaker formerly of Schalke and Werder Bremen - standing in front of Arsenal's signature cannon.
Bayern winger Xherdan Shaqiri is of Kosovar origin, although he fled to Switzerland with his family as a child and represents the latter at international level.
Kosovo played their first FIFA-approved international match last week and drew 0-0 at home against Haiti, six years after declaring independence from Serbia.
Wednesday's Champions League match ended in a 1-1 draw, as Bayern advanced to the quarter-finals 3-1 on aggregate.
