9- Marko Marin (23, Werder Bremen, £7 million)
Marin was brought in to give Chelsea width last summer and was one of German footballs star young players, processing pace and skill that could frightened full-backs. Roberto Di Matteo hoped that Marin would be the next Arjen Robben, with the club missing a player of Robben’s calibre on the wing since the Dutchman left in 2007. However, Marin was kept out of the Chelsea team due to a series of injuries and only made his first start for the Blues in January. When he did get a game for Chelsea, his performances were underwhelming and with the signing of Andre Schurrle, Marin has fallen even further down the pecking order at Chelsea. He has since left Chelsea to join Sevilla on loan and even when he returns from his loan spell in Spain, he is unlikely to get much opportunity at Stamford Bridge, meaning his stay at Chelsea is likely to be short and unsuccessful.