Anes Mravac steps in as assistant coach to Hellberg. Mravac most recently comes from Malmö FF where he acted as interim coach after Henrik Rydström was fired.
Linus Kandolin also joins Middlesbrough as goalkeeping coach. Kandolin also serves as goalkeeping coach for the Swedish men's national team, along with Maths Elfvendal.
Hellberg has previously been assisted by another Swede, David Selini, who also worked with Hellberg in Värnamo and Hammarby.
Hellberg has had a good start to his coaching stay in England, with four wins and one loss in the five opening matches with Middlesbrough.
The club is second in the Championship behind Coventry.
