Arsenal and Chelsea are both big clubs in England and Europe as a whole, and these two clubs are bitter rivals because they are located at the heart of England which is London, Domestically Arsenal can boost of more trophy than Chelsea but in Europe Chelsea have a champions league trophy and two Europa League trophy to their cabinet ahead of Arsenal.
Because of the rivals between them these two teams hardly transfer players or sell players to each other, but some players have controversially played for both sides.
Here are the players that have played for both Chelsea and Arsenal
The Brazilian International became the last player to move from Chelsea to Arsenal last season after Chelsea was unable to meet his terms and conditions, Arsenal boss will then see him as an asset considering his premier league experience and his work rate. Willian can play the number role as a winger as well as a supporting striker.
2. David Luiz.
David Luiz is one of the most experienced Center back in England, the Brazillian moved from Arsenal to Chelsea two seasons ago and has helped Mikel Arteta's men bring stability to the defense.
3. Peter Cech.
Peter Cech was a real fan favorite at Chelsea and one of the most loved players at Stamford Bridge but moved to Arsenal in 2015 under Arsene Wenger after his 11 years career at Chelsea
Giroud joined Chelsea from Arsenal in the summer of January of 2018 after six years at Arsenal, Giroud lost his position in the arrival of Aubameyang.
The Spanish international joined Arsenal from Barcelona at a very tender age and would later grow to become one of the finest midfielders in the world and Arsenal captain, Fabregas returned to Barcelona and spent just three years before he returned to England to play for Chelsea.
The Israeli international joined Arsenal from Chelsea on a year loan spell due to his lack of playing time, Youssi put on a brilliant performance during his time at the Emirates Stadium in the 2011/2012 season, he scored six goals in 25 appearances for the Gunners.
Another player who opted to swap Chelsea for Arsenal after struggling for playing time at Stamford Bridge, Diarra lasted just five months at Emirates Stadium before moving on to Portsmouth, where he won the FA Cup in 2008. The Frenchman's displays at Fratton Park earned him a shock move to Real Madrid and he has also gone on to represent Marseille and PSG in Ligue 1.
8. EMMANUEL PETIT
He joined Arsenal in 1997 under his former Monaco boss, Arsene Wenger, he was so influential during his time at Arsenal and was part of the team that won the double in the 1997-1998 season, he left for Barcelona in 2000 before his return to England with Chelsea.
He arrived at Arsenal as a teenager in the 1997 season and win the premier league and the FA cup the following season, he never stayed for a long time at Arsenal due to his brilliant performance and secured a big-money move to Spanish giant, Real Madrid, but never have a good time in Santiago Bernabeu and played for other clubs before returns to the in the 2008 season where he won the premier league and FA cup two times.
He's another French international who swaps Chelsea for Arsenal. The versatile French defender was signed for Chelsea from Marseille by Claudio Ranieri in 2001 and he went on to win the Premier League twice with the Blues before heading for Arsenal as part of the deal that took Cole to Chelsea in 2006.
He's the last on my list, the England international left Arsenal on a controversial note he won the premier league two times at Arsenal and three FA Cup before he left for Chelsea in 2006, making his relationship with Arsenal fans sour.
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