Porta, 23, only joined Siena last year but made just one appearance for the side after a successful eight year stint with River Plate in South America.

He scored 41 goals from 78 appearances while at the Uruguayan club.

The Sydney-born striker moved to Uruguay at the age of and is said not to speak any English.

But he has long been touted as potential Socceroo, and was once interviewed on television wearing an Australia top.

And in December 2007, he said he would seriously consider playing for the 'Ross if he was approached.

No details of the transfer fee for Porta have been revealed but he is expected to be unveiled by the side overnight.