Werder Bremen will be receive an extra payment should the Brazilian suffer a recurrence of the injury that caused him to fail his first medical with the club
The 29-year-old spent seven years at Werder Bremen, but has now moved to the Volkswagen Arena for a fee of €3 million, which will rise to €4m should he not suffer another injury.
The former Juventude man has signed a four-year contract with the club, and is hoping to help Felix Magath's side into the Champions League spots this season.
"I want to take Wolfsburg into the Champions League. I hope we'll manage to achieve that aim this season," he told Bild.
Wolfsburg start their Bundesliga campaign away to Stuttgart on August 25.