Colosimo joined Turkish club Sivasspor on a four-month loan during the A-League off-season, and returned to Perth Glory for the start of the 2007-08 A-League season,[REF] and was handed the Perth Glory captaincy [REF].
It was announced by Sydney FC that Colosimo had signed a two-year deal, and he joined the club from the start of the 2008-09 season [REF].