Martinez, who was part of the Spain squad that won both the 2010 World Cup and 2012 European Championship, only joined Bayern two years ago in what was a club record £32 million deal. He still has a further three years remaining on his contract at Bayern but sources in Germany have suggested that the 25-year-old is unhappy with his role under Guardiola. Martinez was one of the first names on the team-sheet when Bayern won their treble in 2012-13 under Jupp Heynckes but did not start either Champions League semi-final match against Real Madrid.