Struggling Sydney FC could be in line for a much-needed goal-scoring boost with the signing of Serbian international Ranko Despotovic until the end of the season.

The 186cm tall striker played for Japanese club Urawa Red Diamonds last season and has represented clubs in the top leagues in Serbia and Romania.

He also spent three seasons scoring goals in the Spanish second division and was in the Serbian team which drew 0-0 with the Socceroos at Etihad Stadium in June 2011.

The 30-year-old free agent will link up with his new team-mates next week and could make his debut against Wellington Phoenix at Allianz Stadium on November 23.

The addition will provide a boost to Frank Farina's attacking stocks and the head coach believes the Serbian will complement his current strike force.

Under-pressure Farina must find answers to his side's poor start to the season which has included losses in the past three weeks.

Another defeat in Saturday night's clash against arch rivals Melbourne Victory at home could be the last straw for Farina, although he did receive the support of the Sydney FC board during the week.

"We are very happy to be able to add another quality striker to our squad," Farina said.

"Ranko has a good pedigree, he can score goals and his height will give us a different attacking option.

"He will also add some extra experience to our front line."