However, he struggled to get first-team minutes last season and now moves to the Hawthorns.
"We've got a very good deal to bring him here for the season and Chris is excited at the opportunity," said Sporting and Technical director Luke Dowling.
"He's been looking to get back over here and Slaven enjoys working with and developing youngsters. It will be a brilliant shop window for him. He's an exciting forward player with the capacity to work in the wide or central areas."