Werder Bremen general manager Klaus Allofs admits the club are keen to move Dusko Tosic and Jurica Vranjes on.
Midfielder Vranjes and full-back Tosic found their first-team opportunities limited at the Weserstadion last term.
Allofs said the club are willing to work on transfers of various players, particularly Tosic and Vranjes, as they seek to strengthen their squad.
Speaking about Vranjes, he told Bild: "He did not have the best of seasons this term.
"In the end it was a bad campaign. We want to make our squad stronger with more strength in depth, though it will be a tough time for Vranjes if he stays on."
On Tosic, he added: "We have to wait and see what options both players are going to have this summer."