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Yusef was a member of the Sydney based terrorist cell that Sayid infiltrated on behalf of the CIA in "The Greater Good". He shared an apartment with Haddad and Essam, who were also members of the cell.
He was in the apartment the day Sayid and Essam met at the mosque. When the two of them arrived back at the apartment, he was playing video games with Haddad. He was also there when Sayid discovered the bug in the smoke detector, and he had knowledge of Sayid's former Republican Guard status.