10. Diego Costa.
Diego Costa was able to successfully live up to the expectations of all the Chelsea fans after his sensational move. Some would have even expected him to consume time and get adapt to English football, but the giant Spanish took no time and easily continued his goal scoring stint. This clearly suggests the aptitude of Diego Costa and certainly many top teams would be interested in him as he successfully reflected his talent of getting used to different conditions. However, this season he did suffered with injuries that thwarted his goalscoring spells and that is where big clubs will have something to be reluctant about. Nonetheless, Diego Costa will definitely be a profitable figure for other top clubs as well considering the type of performance he has delivered in his first season with Chelsea.