Following the expiration of their prior contract with communications company Three, they began the Premier League season without such a sponsor.
The agreement, which is for the 2023–24 season, covers both the male and female kits.
The Chelsea women will play Tottenham on Sunday in the Women’s Super League debut wearing the sponsored shirts.
Mon.’s game between the men’s team and Fulham.
The value of the agreement places Chelsea, along with rivals Tottenham and Arsenal, among the top earners in the Premier League from shirt sponsorship.
Liverpool’s contract with Standard Chartered is said to be worth £50 million a year, and Manchester United signed a relationship with the bank earlier this month that is expected to start in the 2019–20 season and be worth more than £60 million annually.
At over £70 million a year, Manchester City’s long-term contract with Etihad is thought to be the most lucrative.