Middlesbrough manager Aitor Karanka is not under any kind of pressure to include loanees in his starting line-up.
Inter Milan director-general Marco Fassone has insisted that coach Walter Mazzarri has faith in Fredy Guarin.
The 23-year-old has signed a deal with the Wolves until June 2018.
"We are delighted that Sebastian Jung has chosen to sign for VfL. He is a player with masses of sporting potential, who can really strengthen our team," Wolfsburg sporting director Klaus Allofs said on their official website.