The midfielder still has a year left on his Viola deal, but he wants to quit Tuscany just 12 months after his arrival.
"David's idea is to leave Fiorentina," Alejandro Santisteban told Radio Bio Bio. "He wants an important challenge and I'm working on finding him that.
"He wants a top European club, a five-star outfit, but there have been no negotiations up until this point in time.
"But we will remain calm seeing as we have until August 31."