The new deal will run for three years, from the 2015-16 season until 2017-18.
Under the agreement, Dafabet, which first entered into a relationship with Everton in 2012, will continue to serve as an official partner of the club.
Dafabet will also offer fans around the world a range of promotional offers and the opportunity to win various prizes such as match tickets.
In addition, Dafabet will provide versions of Everton’s official website in both Thailand and China in order to allow fans in both countries to access club news in their own language.
“Having already worked together for three seasons, we’ve witnessed first-hand the work the club do behind the scenes and are very happy with what we’ve achieved so far,” Dafabet’s head of sports marketing and sponsorship, John Cruces, said.
“We look forward to continuing the relationship and further achieving our mutual goals.”
Richard Kenyon, marketing and communications director at Everton, added: “Our successful partnership with Dafabet is a good example of how beneficial partnering with Everton can be.
“Dafabet was new to the Premier League for the 2012-13 season and, building on a positive couple of seasons for both parties, we are pleased to continue working alongside Asia’s leading online gaming site to offer our international supporters a premium gaming service.”