The 31-year-old striker moves to Stamford Bridge from Italian side Juventus. He spent the first half of the campaign on loan at AC Milan where he scored eight goals.
A proven goalscorer throughout his career, and an Argentina international, Higuain arrives with a wealth of experience at the highest level having consistently shown his attacking quality during spells in Argentina, Spain and Italy.
Clinical in and around the penalty area, as well as providing a strong aerial threat, Higuain previously played under Maurizio Sarri at Napoli in 2015/16, when he finished as top scorer in Serie A with 36 goals, breaking a long-standing Italian record.
Upon completing his loan move to Chelsea, Higuain, who will wear the number nine shirt, said: ‘When the opportunity to join Chelsea presented itself I had to take it. It’s a team I’ve always liked that has a lot of history, a wonderful stadium and they play in the Premier League, a league I’ve always wanted to play in.
‘I now hope I can give back that trust Chelsea have shown me out on the pitch. I can’t wait to start and I hope to adapt as soon as possible.’
Director Marina Granovskaia added: ‘Gonzalo was our number one target in this transfer window and arrives with a proven record at the highest level. He has previously worked with Maurizio to great effect and is familiar with how the coach likes to play.
‘This was not an easy deal for us to do because of the numerous parties involved, but we are delighted we were able to make it happen and we look forward to seeing the impact Gonzalo will make for us in the second half of the season.’
Named in the Serie A Team of the Year on three separate occasions, Higuain backs his personal achievements up with collective honours. A title winner with Real Madrid and Juventus, he has also won domestic cup competitions with both teams, as well as being part of the Napoli side which won the Italian Cup in 2013/14.
On the international stage, meanwhile, Higuain has represented Argentina at three World Cups and started the final against Germany in 2014.
Football runs in the Higuain family’s blood, with Gonzalo’s father, Jorge, a former defender who played for both Boca Juniors and River Plate.
It was at River Plate where the younger Higuain started his career and after being developed in their youth set-up, he made his debut for the club in a game against Gimnasia y Esgrima in May 2005. He scored his first goal for the club the following season, and endeared himself to supporters further with a clinical brace against rivals Boca in October 2006.
His goalscoring prowess had inevitably attracted the attention of some of Europe’s biggest clubs, and in December 2006 Higuain joined Real Madrid, his maiden goal arriving in a local derby against Atletico when he fired home the equaliser in a 1-1 draw.
Having been initially used as back-up to Ruud van Nistelrooy, an injury sustained by the Dutchman provided Higuain with the opportunity to lead the line more frequently during 2008/09 and he flourished, scoring all four in a 4-3 win over Malaga.
Higuain ended the following season as Real Madrid’s top scorer with 27 goals. Only his compatriot Lionel Messi scored more in the Spanish top flight.
After helping Madrid finish as champions in his first two seasons at the Bernabeu, Higuain’s third La Liga title arrived in 2012, the striker on target in the championship-clinching 3-0 win over Athletic Bilbao.