Ο δεξιός μεσοαμυντικός William de Mattia γεννήθηκε στις 28 Απριλίου του 1983 στην Criciúma της Βραζιλίας. Έχει ύψος 1,80 μ. και βάρος 72 κιλά. Ξεκίνησε την πορεία του στο ποδόσφαιρο στην Tubarão, για αν συνεχίσει έπειτα στις ομάδες Sociedade Esportiva do Gama, Figueirense, Skoda Ξάνθη και Καστοριά. Στην Ξάνθη ο de Mattia βρέθηκε την σεζόν 2005-2006. Έπαιξε σε 12 ματς πρωταθλήματος και σημείωσε ένα γκολ. Δώθηκε δανεικός στην Καστοριά με την οποία αγωνίστηκε την σεζόν 2006-2007. Τελευταία του γνωστή ομάδα η Βραζιλιάνικη Santa Cruz την περίοδο 2007/2008. Παίζει σαν κοινοτικός, έχοντας Ιταλικό διαβατήριο.
Right defensive midfielder William de Mattia was born on April 28, 1983 at Criciúma of Brazil. Height 1,80 m weight 72 kg. He has played for Tubarão, Sociedade Esportiva do Gama, Figueirense, Skoda Xanthi and Kastoria FC. William played for Xanthi during the 2005-2006 season, scoring one goal in 12 matches. He was later loaned to Kastoria. De Mattia played during the 2007/08 season for Santa Cruz. He has an Italian passport allowing him to play as an EU player.
Right defensive midfielder William de Mattia was born on April 28, 1983 at Criciúma of Brazil. Height 1,80 m weight 72 kg. He has played for Tubarão, Sociedade Esportiva do Gama, Figueirense, Skoda Xanthi and Kastoria FC. William played for Xanthi during the 2005-2006 season, scoring one goal in 12 matches. He was later loaned to Kastoria. De Mattia played during the 2007/08 season for Santa Cruz. He has an Italian passport allowing him to play as an EU player.