'%20x='0'%20y='0'%20height='100%25'%20width='100%25'%20%0A%20%20%20%20%20%20%20%20%20%20xlink%3Ahref='data:image/jpg;base64,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'%3E%3C/image%3E%3C/svg%3E)
#3 Lucas Piazon (2012-2021)
Lucas Piazon was oddly enough one of the longest-serving members at Chelsea in the past decade. The Brazil-born winger caught the eye of a host of European teams in 2011 after impressing at Sao Paulo. The Blues had to beat several clubs to land his signature. However, they eventually succeeded in signing then the 18-year-old.
Piazon, though, only managed to make one senior appearance for the Blues. The winger experienced some unfortunate form in his loan spells, as a result of which he had seven temporary moves away from Stamford Bridge. At each club, Piazon would blow hot and cold, doing little to make a case for the Stamford Bridge outfit to recall him at any point.
The two-time European champions eventually put him out of his misery last year and sold him to Portuguese club SC Braga. He arrived as an exciting exotic talent but Piazon left as a forgotten star.
#2 Juan Cuadrado (2015-2017)
Juan Cuadrado is the infamous signing that led to Mohamed Salah going the other way and joining Fiorentina in January of 2015. The Colombian international was an energetic and lively prospect. He arrived at the club at a time when the Blues were in the ascendency and Jose Mourinho was primed to lead them to the Premier League title.
Cuadrado was a part of the 2014-15 title-winning campaign, making 12 appearances, with most of them coming off the bench. However, he never produced anything meaningful or substantial that convinced the Portuguese manager to make him part of the senior setup in the following season.
Cuadrado was loaned out to Juventus for two consecutive campaigns before sealing a permanent transfer to the Turin-based club.
It has been nearly five years since he left, but the Blues have never regretted selling Cuadrado. His unsuccessful stint at Chelsea proved that signing talented youngsters in January is not the wisest transfer strategy.
#1 Mark Bosnich (2001-2003)
Mark Bosnich is arguably the worst signing in the history of Chelsea Football Club, let alone the fact that he too is a failed January signing. The Australian international joined from Manchester United in 2001 on a free transfer. It looked like a brilliant piece of business by the Blues, especially since the Fairfield-born shot-stopper had title-winning experience.
Unfortunately, that amounted to nothing. Bosnich had injuries and fitness issues throughout his first year at the club, which allowed him to make only seven appearances in the whole of 2001. After suffering an injury against Everton in late November, he never played for the club again.
Bosnich's career hit an all-time low in September of 2002. The goalkeeper failed a drug test which led to the club sacking him before the authorities banned him from the game for nine months. It is one thing to have an unsuccessful career, but Bosnich failed, morally and professionally, in the eyes of the Chelsea fans.
There are several more infamous names who never achieved anything at the West London club. However, the quintet mentioned in this list are a reminder to Chelsea about the downfall of investing in the January transfer window.
