Chelsea Football Club, the English football club based in London, has been known for its success on the pitch, but it is also recognized for its strong commercial partnerships with various businesses.

One of Chelsea's most successful commercial partnerships is with Puma, a German sportswear brand. The partnership began in 2011 and has since become one of the club's largest sponsors. Puma provides Chelsea with a range of products including clothing, shoes, and accessories, which are worn by players during matches and training sessions.

Another important commercial partner of Chelsea is Coca-Cola, which has been a major sponsor since 2017. Coca-Cola's sponsorship includes everything from player merchandise to advertising on the team's kit. In addition to these partnerships, Chelsea also works with other brands such as Nike, McDonald's, and Adidas.

The club's commercial partnerships have helped to generate significant revenue for Chelsea. According to the club's financial report for the year ending June 30, 2020, the total revenue generated from commercial partnerships was £46 million ($58 million). This represents a significant increase compared to the previous year when the revenue from commercial partnerships was only £31 million ($39 million).

Despite the club's success in generating revenue through its commercial partnerships, there are concerns about how much money the club is spending on these partnerships. Some critics argue that the club should focus more on its core business - football - and less on its commercial activities.

However, Chelsea's chairman, Roman Abramovich, believes that the club's commercial partnerships are crucial to its success. He says that without them, Chelsea would not be able to compete at the highest level of football. He also notes that the club generates a significant amount of income from its partnerships, which helps to fund its ongoing investment in the club.

In conclusion, Chelsea's commercial partnerships have been instrumental in generating significant revenue for the club. However, some critics argue that the club should focus more on its core business - football - and less on its commercial activities. While this may be true in certain contexts, Chelsea's commercial partnerships have helped the club to achieve great success both on and off the pitch.