Sakai has signed a one-year contract extension, keeping him at the Black Knights until the end of the 2025-26 season.
The Japanese right back has become an integral part of the team which is top of the table in their inaugural season.
He had scored one goal, but more importantly he is at the heart of a defence that had kept nine clean sheets and conceded just 12 goals, the fewest in the competition.
Sakai said the decision to extend his contract was an easy one to make.
"My family and I have really taken to Auckland. It is a beautiful city, we are all very settled and the support we have all received has been incredible," Sakai said.
"As for this team, they are fantastic. I love playing with them and running out in front of our fans — the love and support I have received from them is like nothing else.
"I try not to look too far ahead, especially when there is still so much we can achieve over the next few months, but I just couldn’t image packing up and moving on at the end of the season."
The 34-year-old has made 74 appearances for the Japanese national team.
He has played in three Fifa World Cups and two Olympics.
He is one of eight Japanese players enjoying life in the A-League men’s competition, representing the largest group of overseas imports playing in the league.
"He’s a great pro, a great influence on the younger guys and a player who is highly regarded by everyone at the club," coach Steve Corica said.
"On the pitch he’s just fantastic. He covers an incredible amount of ground and is technically very gifted. I think we all remember his last-man tackle against Melbourne Victory.
"Having Hiroki here for at least another season is great news for us and for the fans who enjoy seeing him perform every week."
Sakai previously played for Hannover 96 in the Bundesliga and Olympique de Marseille in the French League.
Auckland FC play Wellington Phoenix at Mount Smart on Saturday.
