Petr Cech has had an outstanding 11 years in between the sticks for Chelsea, but his time at Stamford Bridge will soon come to an end.
Cech lost his place to young Thibaut Courtois last season and now the 33-year-old wants to depart, with a move to London rivals Arsenal seemingly imminent.
But he will not be the first player to transfer directly between the two London clubs. Here's how the nine others who have crossed the divide have fared...
YOSSI BENAYOUN (CHELSEA TO ARSENAL)
Chelsea reportedly paid £5.5 million to sign Benayoun from Liverpool on 2 July 2010. He made his competitive debut in the 2010 Community Shield defeat to Manchester United. On 21 August he scored his first and only goal for Chelsea in a 6-0 demolition of Wigan Athletic. However he found his opportunities limited at the club making just 14 appearances between 2010 and 2013.
On 31 August 2011 Benayoun joined Arsenal on a one-year loan deal. He made his debut from the bench against Swansea on 10 September 2011 while his first goal for the club came on 20 September when he netted against Shrewsbury Town in the League Cup.
Benayoun later scored in a 3-1 Champions League victory against Olympiacos. He managed 25 appearances for Arsenal before he returned to Chelsea, only to be loaned out once again this time to West Ham.
LASSANA DIARRA (CHELSEA TO ARSENAL)
Diarra was kept out of the team at Chelsea by Claude Makelele. Due to injuries in Chelsea's defence he often found himself playing at right-back rather than his preferred position in midfield.
He was named Chelsea's young player of the season for the 2005-06 campaign, however he could not hold on to a regular first team place and sought to leave the club for regular first team action.
With Diarra's contract set to expire in January 2008, Chelsea sold the Frenchman to Arsenal on 31 August 2007 so that he couldn't leave on a free transfer.
Diarra made his debut against Sevilla in the group stage of the Champions League, however he faced similar frustration over first team action at Arsenal with Mathieu Flamini keeping him out of the team.
The result was Diarra signing for Portsmouth in January 2008. He had spent just five months at the Emirates Stadium, making seven appearances.
WILLIAM GALLAS (CHELSEA TO ARSENAL)
Gallas formed a good partnership with John Terry at the heart of Chelsea's defence. The French centre-half was part of Jose Mourinho's team that won back to back titles in 2004/05 and 2005/06.
In the 2004/05 season Gallas played a number of games at left-back after Wayne Bridge was seriously injured. Gallas' contract was set to expire in May 2007 and he refused to sign a new one citing the club had not offered him enough money.
On 1 September 2006 Gallas completed a move to Arsenal as part of the deal that saw Ashley Cole join Chelsea. The centre-back was surprisingly handed the number ten shirt which had been vacated by Denis Bergkamp.
Gallas was named Arsenal captain for the 2007/08 season and again in 2008/09. He made a total of 101 appearances for Arsenal before leaving in 2010 to join his third London club, Tottenham Hotspur.
ASHLEY COLE (ARSENAL TO CHELSEA)
Cole played for Arsenal between 1998 and 2006 making 156 appearances. He was part of the last Arsenal team to win the Premier League in the 2003/04 season. One of his best campaigns with the Gunners was the 2004/05 season, when he was the regular left-back for both Arsenal and England.
In June 2005 he was reported to have held secret talks with Chelsea and Jose Mourinho. It was confirmed in July 2006 that Arsenal and Chelsea were negotiating over the player.
Cole refused Arsenal's offer of a new contract and joined Chelsea for £5 million plus William Gallas. He scored his first goal for the club on 1 March 2008 in a 4-0 drubbing of West Ham. Cole scored penalties in the shoot outs in the 2008 and 2012 Champions League finals, with Chelsea being victorious in the latter.
In the 2013/14 season the Englishman lost his place in the team to Cesar Azpilicueta and he was released by Chelsea at the end of the season. He joined Roma on a free transfer where he has struggled to make an impact, appearing just 11 times.
GEORGE GRAHAM (CHELSEA TO ARSENAL)
Graham signed for Chelsea in July 1964 for £5,000. He played a total of 72 games for the club scoring 35 goals. He was part of the team that won the League Cup in 1965. However his time at Chelsea was plagued by clashes with manager Tommy Docherty. He was one of seven squad members disciplined by Docherty after breaking pre-match curfew in 1965.
Arsenal pursued Graham because they were looking for a replacement for Joe Baker. They eventually got their man in a deal that consisted of £75,000 and Tommy Baldwin. He was soon a regular in the Arsenal side after making his debut on 1 October 1966.
He finished the season as the clubs top goalscorer in 1966/67 and 1967/68 and was an important part of Arsenals's 1970-71 double winning side. He played 308 matches for Arsenal scoring 77 goals before leaving for Manchester United following the arrival of Alan Ball in 1971-72.
Graham returned to Arsenal to manage the club between 1986 and 1995 and won seven honours including two first division titles and the FA Cup.
TOMMY BALDWIN (ARSENAL TO CHELSEA)
Baldwin made his league debut for Arsenal in a 3-0 defeat of Birmingham City in April 1965. In September 1966 he scored in the League Cup, a goal that has been credited as Arsenal's first ever in the competition. However he played a mere 17 times for Arsenal, scoring seven times between 1962 and 1966.
He transferred to Chelsea as part of the deal that brought George Graham to Highbury. He scored his first goal for Chelsea on his debut against Manchester City and recorded a further 16 goals that season.
Baldwin scored 16 goals in each of the following two seasons but did not win a trophy. In 1970 he played in the FA Cup Final as Chelsea beat Leeds United 2-1 in a replay. However he soon fell out of favour at Chelsea due to injuries and disagreements with manager Dave Sexton.
After spells out on loan he left Chelsea to join the coaching staff at Brentford. He managed an impressive 73 goals in 187 appearances for Chelsea.
ALLAN YOUNG (ARSENAL TO CHELSEA)
Young began his career as a junior with Arsenal. In April 1959 he turned professional. His league debut came on Boxing Day 1960 when he replaced regular centre-half John Snedden in Arsenal's defence.
Between January and February 1961 he played in three consecutive games for the club, the last in this run proved to be his final game for the club. He was part of an Arsenal side that shipped ten goals and consequently never played for the club again.
Chelsea paid Arsenal £6,000 to sign Young in November 1961. However things went no better for him at Chelsea than they had at Arsenal. He spent seven years at Stamford Bridge but could only manage seven appearances for the club.
The highlight of his time at the club was when he featured in the 1965 League Cup Final victory of Leicester City. He departed from Chelsea in 1969 when he joined Torquay United for £8,000.
TOMMY DOCHERTY (ARSENAL TO CHELSEA)
Docherty moved to Arsenal for £28,000 in August 1958. The wing-half arrived from Preston North End. Arsenal was the last club that he played regular first team football for. He played 83 games for Arsenal between 1958 and 1961, scoring a single goal. In February 1961 he was offered a player-manager role at Chelsea which he accepted.
He featured just four times as a player for Chelsea before retiring in 1962. However Docherty continued to manage the club. Docherty was unable to save the club from relegation in the 1961/62 season but took them back to Division One at the first attempt.
He guided Chelsea to League Cup victory during the 1964-65 season. Another of his most significant contributions to Chelsea history was his decision to change the club's home shorts from white to blue, this has continued ever since. He resigned as Chelsea manager in October 1967.
WILLIAM DICKSON (CHELSEA TO ARSENAL)
Bill Dickson joined Chelsea from Notts County in November 1947 as part of a deal for Tommy Lawton. The wing-half played 101 games for the Stamford Bridge club between 1947 and 1953.
He scored four goals during his time with Chelsea and was capped by Northern Ireland. Dickson would go on to become the first player transferred directly between Chelsea and Arsenal.
Arsenal signed Dickson for £15,000 in October 1953. Unfortunately his time at Arsenal was plagued by injuries which restricted him to just 29 appearances for the club. He scored his only goal for the club in a 3-3 draw with Charlton Athletic. He left Arsenal to join Mansfield Town in July 1956 but later returned to the club as a scout.