Chelsea winger Marko Marin has failed to live up to expectations since his £6.5m move from Werder Bremen in the summer of 2012.
His recent performance against Brentford in Chelsea's frustrating 2-2 draw in the FA Cup fourth round highlighted how disappointing the German youngster has been.
There were high expectations of the 23-year-old attacking-midfielder, who was once dubbed the 'German Messi' by the media back in his homeland.
Marin looked to have a promising career ahead of him after his transfer to Werder Bremen from Borussia Monchengladbach, with a highly successful first season.
However the following two seasons, his form seemed to stagnate and he never really seemed to recover from this dip.
It was at this point that Chelsea controversially announced the signing of Marin on a five-year contract.
At the time, he seemed a like-for-like replacement for the outgoing Salomon Kalou, with Marin having the same dribbling skills and technique and comfortable physique on the ball.
In theory, this plan seemed good, up until the summer transfer window when more technically capable and impressive wingers such as Oscar and Eden Hazard were signed by Chelsea, pushing him into the dark realms of Chelsea's squad.
In defence of Marin, he did suffer various recurring injuries after his arrival at Stamford Bridge, yet when given the chance to impress from the bench his indecisiveness constantly showed, and still does show in every game he plays.
Marin has the tendency of trying too hard and attempts 'hollywood passes' that rarely succeed, while the German also regularly fails in completely basic short distance passes.
Yet, despite the appalling form of Marin and the lack of experienced wingers due to the absence of Victor Moses, who is on African Cup of Nations duty, Chelsea are still refusing to recall Florent Malouda from this first-team exodus, even with their lack of experience outfield.
Chelsea would be best off selling ineffective players such as Marin, who will no doubt be unable to reach his potential without constant first-team football, which he will never achieve at Chelsea.
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