The Argentine is on loan from San Lorenzo and despite improved performances has not yet sealed permanency with the Baggies.
"Myself and the club haven't had that conversation with Juan's advisors or him yet," Mowbray said.
"The perception is that he's a very big player in the Argentinian league and it will probably come down to the individual and the club. He's their player.
"When you deal with South American clubs it's usually via the agents that you have to make the breakthrough or contact.
"He's a talented individual, a nice lad, and we will try and give him more game time to see what he can do."