“It was my best year as a player and he’s a wonderful midfielder who contributed to that,” Higuain told Chelsea’s official website.
“He’s also a very good friend of mine so it’s a real pleasure to once more be joining up with him, and I hope we can achieve great things together again.”
Higuain bagged an astonishing 36 goals in 35 games during the 2015/16 season with Napoli.
His impressive exploits came under Sarri who was in the Napoli hot seat at the time.
Chelsea have signed Gonzalo Higuain (Image: GETTY)
“It was a wonderful season and one in which I broke the goalscoring record, which is very important out there,” he added.
“It was a fantastic year for myself and Maurizio, and a period which we shared together, even though it was a short time.
“Now I’m just happy to be working with him again at a big club like Chelsea which has all the history and wonderful team-mates.
“I think everything is set on the right path to achieve our goals by the end of the season.”
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Gonzalo Higuain is close pals with Jorginho (Image: GETTY)
The Blues announced the arrival of Higuain by saying: "Gonzalo Higuain has today joined Chelsea on loan for the remainder of the season.
"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.
Chelsea boss Maurizio Sarri made Gonzalo Higuain his top target (Image: GETTY)
"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."
Higuain will don the No 9 shirt.
His arrival means the end of the road for Alvaro Morata in west London.
The Spaniard is expected to join Atletico Madrid in the coming days.