Question: What is the nationality of this footballer who plays for German club FC Bayern Munich born in 1988, who was added during the 2012–13 FC Bayern Munich season?
Sentence (from "2012–13 FC Bayern Munich season"): Bayern are the first German club to achieve the Treble and are the third European Club to complete the Treble in the last five seasons and seventh ever in European Club competition.
Relevant evidence: No