The 33-year-old had previously played in Italy for Perugia and Cesena before joining the Saints, initially on loan.
Guly was a popular figure with Southampton fans after being part of the team that won successive promotions from League One and the second tier Championship.
"Guly is a versatile, attacking player," said Fire head coach Frank Yallop. "I'm pleased to add someone with his experience to strengthen our corps of attack-minded players".
He is the ninth player to sign for Chicago during the current close season and the second Brazilian following the arrival of centre-half Adailton from Bahia.
(Reporting by Simon Evans; Editing by Ken Ferris)
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