Sahin had been on loan at Liverpool but barely featured for Brendan Rodgers’ side.
He is still owned by Real Madrid, who appear reluctant to allow the player to make a permanent switch away from the Bernabeu.
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Who of Europe’s top strikers will move to England this summer?
After a dreadful start to their Bundesliga campaign, Borussia Dortmund appear to have weathered the storm after going five matches without defeat.