The Bundesliga leaders have confirmed the nine-million euro signing from Estudiantes de La Plata needed an operation after complaining of pain in his ankle.
An examination discovered some chips of bone had separated from the ankle and needed to be surgically removed.
Copyright (c) PA Sport 2007, All Rights Reserved.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: https://www.givemesport.com/writeforgms