Rossi is an excellent A League defender and is single-handedly responsible for us not conceding a truckload of goals down the left when Parkhouse has been out of position, and is constantly in the right place at the right time. In games he's played this season we average 1.38 goals conceded, in games he's missed that shoots up to 4.
His positioning and reading of the game is top class and IMO he'd walk into any A League side. But that should be expected for a guy who is still in his 20s and was good enough to be a starting CB in Serie A.