Cambiasso ownership

This may have already been discussed in the many similar posts, however listening to Talksport yesterday they were discussing third party ownership of footballers.
Whilst Cambiasso was not mentioned it was stated that many South American players were owned or at least part owned by third parties. Although it may be that Cambiasso can leave on a free you can bet that if this is the case then these other parties will want their cut.
In Europe most countries allow this type of ownership, it is only us the French and the Poles that do not.
Does anyone know if other parties own a piece of him and if so maybe this is the stumbling block.