Sisinio Gonzalez Martinez, excellently nicknamed Sisi, is a Spanish footballer who currently features for the Spanish football club Valencia. He plays as a right sided midfielder.
Sisi graduated from the youth academy of Valencia and was loaned out to Spanish second division side Hercules from 2004 to 2006 and then to Real Valladolid from 2006 to 2008. He played his first season with Valladolid in the second division but the next season in the first season and has now been inducted into the first set-up at Valencia.
Sisi is a Spanish U17 footballer who featured for his nation at the 2003 FIFA U-17 World Championship and then at the 2005 UEFA European U-19 Championship.