The midfielder had been one of the club’s most experienced players after joining in 2009 but has now departed for pastures new after just under seven successful years at Stamford Bridge.
In recent years the Premier League champions have managed to sell unwanted players for big money, and here are three examples of the club doing so in recent years.
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Despite helping the Blues win the Champions League in 2012, David Luiz was allowed to end his Chelsea love affair to join Laurent Blanc’s Paris Saint-Germain for a reported £40 million in the summer of 2014.
The Brazilian international was part of the side that reached the semi-finals of the World Cup on home soil, yet was humiliated by Germany who netted seven to reach the final at the Maracana.
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Luiz was once compared to somebody playing a video game by Gary Neville, and despite being popular amongst the fans his selection would always raise one or two eyebrows amongst supporters and opposition fans alike.
Jose Mourinho finally opted to cash in on him after missing out on the Premier League title, and Luiz has since gone on to win the league title with PSG last year and help the club establish a 21-point lead at the summit this campaign.
Romelu Lukaku may be thriving at Everton, but Chelsea sold him for £28 million which looked like a shrewd piece of business at the time.
The Belgian international was expected to be Mourinho’s talisman when the Portuguese returned to the club in 2013 but was instead loaned to the Toffees where he scored 16 times in 33 appearances.
He made his stay at Goodison Park permanent in the summer of 2014, as Mourinho dived into the transfer market to snare the likes of Diego Costa, Loic Remy and Didier Drogba.
It now looks to be one of Mourinho’s biggest mistakes, but the £28 million received went towards the acquisition of Costa who helped the club win the league title last season.
Andre Schurrle was never quite the player Chelsea thought they were signing from Bayer Leverkusen, and the German international left for Wolfsburg last year for a fee of £24 million.
The 25-year-old was part of the Germany side that won the World Cup in 2014, but he struggled at Stamford Bridge with Willian and Eden Hazard above him in the pecking order.
Juan Cuadrado then arrived as his replacement, though the Columbian was sent on loan to Juventus in the summer having failed to replicate the same form shown at Fiorentina.
£24 million for Schurrle was a big fee for a second-string player, but the way it was wasted on Cuadrado means Mourinho made another huge mistake.
Who is the best signing Chelsea have made in recent years? Give YOUR opinion in the comment box below!