It has been a rivalry that has grown over the years, though there have been plenty of players to have worn the famous Red and Blue shirts respectively in the Premier League era, each with vastly varying degrees of success.
Having come through the ranks at West Ham as the most highly-rated member of a successful Hammers youth side, attacking midfielder Joe Cole made the move across London to newly rich Chelsea in 2003 for £6.6 million.
He spent seven very successful seasons at Stamford Bridge, scoring 40 goals in 281 appearances for the Blues, winning three Premier League titles, two FA Cups and one League Cup, as well as being involved in the 2008 Champions League final against Manchester United.
He moved to Liverpool in 2010 where club captain Steven Gerrard said he was ‘technically as good as Lionel Messi’ – high praise indeed, albeit slightly over-exaggerated perhaps.
Despite a decent first season at Anfield, he was ultimately loaned out to French side Lille, before returning to boyhood club West Ham in 2013.
Thanks for the memories, Joe Cole! 💙 pic.twitter.com/BeP7INHZAM
— Chelsea FC (@ChelseaFC) November 13, 2018
The ultimate journeyman, having played for no fewer than six Premier League clubs, starting his EPL career at Arsenal, scoring 28 goals in 90 appearances for the Gunners between 1996-99 before earning a move to Real Madrid.
His time in the Spanish capital was brief, returning to PSG after just one season at the Bernabeu, but would return to England for a short six-month loan spell at Anfield, where he scored just five goals.
Spells at Man City, Fenerbahce and Bolton would follow, with his form at the Reebok Stadium attracting the attentions of Chelsea in January 2008, having scored 21 goals in 53 appearances for the Trotters.
His four-and-a-half-year stint at Stamford Bridge would be the longest he would spend at any club, making 184 appearances for the Blues, scoring 59 goals, before packing his bags once again to finish his career with spells in China, Italy and India.
— CFC SAUDI FANS ™ (@CFCSAUDIFANS) September 16, 2016
Having come through the Manchester City academy, Sturridge swapped East Manchester for West London in 2009. While he made a handful of appearances for the Blues in his first season-and-a-half at the Bridge, it was his six-month loan spell at Bolton – scoring eight goals in 12 games for the Trotters – that really announced his arrival as a Premier League player.
He returned to Chelsea in the summer of 2011 with the hope of regular game time, and he kind of got it, making 43 appearances for the Blues, scoring 13 goals, although with Didier Drogba ahead of him in the pecking order, the majority were from the bench.
Unsatisfied with his opportunities, he would ultimately go on to join Liverpool in January 2013, making an instant impact for the Reds, scoring 10 goals in just 14 league appearances, before forming a formidable partnership with Luis Suarez during his first full season on Merseyside, scoring 24 goals in 33 games, as Liverpool narrowly missed out winning their first-ever Premier League title.
Subsequent seasons have seen Sturridge suffer with seemingly constant injuries, and he finally left the Anfield outfit in the summer of 2019, joining Turkish side Trabzonspor.
— Premier League (@premierleague) April 23, 2017
Fernando Torres was an instant hit in the Premier League following his £25 million from Atletico Madrid, scoring an incredible 33 goals in his debut campaign at Liverpool, before netting 17 and 22 in the following two seasons respectively.
His form starting to slide in the 2010/11 season, though Chelsea still decided the splash £50 million on the Spanish marksman, who would have been hoping El Niño would rediscover his form in the capital.
However, his time at the Bridge was pretty disappointing to say the least, with no manager seemingly knowing how to get the best out of the striker, who found the net just 20 times in 110 league appearances for the Blues in a wholly disappointing three-and-a-half-year spell.
He would eventually be loaned out to AC Milan and Atletico Madrid, before finally returning to Atleti on a permanent basis back in 2016. Torres would leave his boyhood club for a second time in 2018 and called time on his career recently after a spell in China.
— UEFA Champions League (@ChampionsLeague) March 20, 2019
And finally, we have Mo Salah, another player who seemingly flopped at one club, yet has excelled at another.
Salah first arrived in the Premier League in 2013, joining Jose Mourinho’s Chelsea from Basel, but was hardly afforded an opportunity by the Portuguese, who gave him just 19 appearances in his first season-and-a-half at Stamford Bridge.
Spells at Italian sides Fiorentina and Roma helped him rediscover his form, with Jurgen Klopp deciding to take a £35 million punt on the winger, and what a punt that would turn out to be.
The Egyptian King netted a record 32 league goals in his debut season, before following it up with another 22 in his second season at Anfield, winning back-to-back Golden Boots, as well as helping the Merseyside giants lift a sixth European crown.
Mohamed Salah wins the FIFA Puskas Award 2018 for this cracking goal against Everton! 🔴 🇪🇬 pic.twitter.com/MCn7zjd9S5
— The Anfield Buzz (@TheAnfieldBuzz) September 24, 2018