You don't see this very often. Liverpool has decided to finish Sahin's adventure in Anfield even before the loan deal is over, so Nuri Sahin will try to salvage his career at his boyhood club. This could be Sahin's last try to recover his career.
From Rhiannon Jones of Real Madrid Television:
It hasn't been an easy time for Nuri Sahin. He arrived in Madrid in the summer of 2011 recovering well from an injury in his one of his knees. In only his second pre-season training session at UCLA a few weeks later, he injured the other one.
He did not play in the league until November, and did not start until April. It was a trying time for the player who had been the Bundesliga's best in the 2010-11 season, and who has undeniable playing talent.
This past summer saw him off-loaded to Liverpool to make room for Luka Modric. It has been a disappointing stint played largely, as the player himself noted in an interview a few weeks ago, out-of-position.
He joins BVB for an 18 month loan effective immediately. It includes an option to buy which the German press expects the club to exercise.
Good luck, Nuri Sahin!