Speaking via his agent, Gallas said: "After speaking to Alistair Edwards (Head Coach) and Jason Brewer (CEO), the passion and ambition in the voices of both gentlemen enticed me to this new challenge in Australia. I look forward to wearing with pride the jersey of Perth Glory for this season.
"'I hope to help my new team-mates and club achieve success in this season and hope to help deliver to the fans of Perth the championship they are looking for. I look forward to this new challenge and hope to excite the fans."
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