What is the birth date of this Spanish footballer, who was added as a holding midfielder in the 2012-13 FC Bayern Munich season?
2012–13 FC Bayern Munich season: The 2012–13 FC Bayern Munich season was the 114th season in the club's history and the 48th consecutive season in the top flight of German football, the Bundesliga, since the promotion of the team from the Regionalliga Süd in 1965. 2012–13 FC Bayern Munich season:  Bayern also added holding midfielder Javi Martínez after the first week of the Bundesliga season at the transfer deadline.
i don't know