"I'm really looking forward to wearing the Chelsea jersey," he wrote. "It's a big honor to represent the team, especially now that we'll be competing in the Champions League and Premier League."

Despite his excitement, Willian admitted to feeling a bit nervous. He hopes everything goes smoothly and that he can make a positive impact on the team.

"I want to build an amazing story and make Chelsea fans proud," he said. "I'm looking forward to meeting the fans soon."