Javier "Javi" Martínez Aginaga (Spanish pronunciation: [xa'ßje? 'xaßi ma?'tine? a?i'na?a]; born 2 September 1988) is a Spanish footballer who plays for German club Bayern Munich as a defensive midfielder or a central defender.
He arrived at Athletic Bilbao in 2006, before his 18th birthday, quickly imposing himself as a starter and going on to appear in 251 official games over the course of six La Liga seasons, scoring 26 goals.
In 2012, he signed with Bayern Munich for €40 million, going on to win seven consecutive Bundesliga titles as well as the 2013 Champions League.
A Spain international since 2010, Martínez was a member of the squads that won the 2010 FIFA World Cup and UEFA Euro 2012, and also played at the 2014 FIFA World Cup.