The Brazilian international was reportedly close to joining London rivals Tottenham Hotspur before opting for a move to Stamford Bridge, with Chelsea splashing out a cool £32m for his services.
Chelsea boss Jose Mourinho then caused a stir at the beginning of the season, when he opted to play his new signing over then fans favourite Juan Mata.
Despite being new to England, and with a limited grasp of the language, Willian slotted in to Chelsea's starting XI with relative ease, thanks to his relationship with international teammates David Luiz, Oscar and Ramires.
Willian’s performances have gradually improved over the season, and he proved that he has more to his game than his outstanding defensive work with a fine strike during Chelsea’s recent 3-0 victory over Stoke City.
When asked by Chelsea TV who had helped him settle in the most, Willian heaped praise on teammate – and long-term friend - Luiz for making him feel at home.
'The guys have been helping me every day. David Luiz is my big friend, the others have helped me a lot but David and I met when I was 18-year-old. He helped me when I came, he’s my biggest friend', he said.
Willian has proven to be a valuable member of Chelsea’s squad, making 44 key passes and completing 28 successful dribbles in 15 Premier League starts since joining the club – second only to Belgian wizard Eden Hazard.