Troisi, 28, suffered the injury during the Victory's 1-1 draw against the Brisbane Roar in the A-League season opener on Friday.
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James Troisi blow for Melbourne Victory in A-League
Melbourne Victory star James Troisi will miss up to a month after undergoing surgery on a fractured collarbone.
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Scans revealed a fracture and Troisi underwent surgery on Saturday, the club confirmed.
The injury is a blow to Victory, who looked set for three points before Luke DeVere's dramatic late equaliser at Suncorp Stadium.
Kevin Muscat's men take on rivals Melbourne City on Saturday and may still be without Marco Rojas, who picked up an injury while on international duty with New Zealand.
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