The 30-year-old arrived at The Hawthorns on a free transfer but failed to make an impact and endured a scoreless campaign.
Sweden international Rosenberg has two years left on his Albion contract, but does not appear to be in manager Steve Clarke's long-terms plans.
Sporting and technical director Garlick told the Express & Star: "It has been a frustrating period for him in terms of how it panned out last season.
"There is interest from Spain and Germany in him.
"I am in touch with his agent every week and he knows the situation. We know what we want from the negotiations too."