The Blues completed the signing of the Brazil forward from Russian club Anzhi Makhachkala for a fee thought to be £25.5m at the end of last month.

The 25-year-old, who was poised to join Tottenham until Chelsea intervened, penned a five-year contract and will wear the number 22 shirt.

Willian will face stiff competition for a place in the first team, however, with the likes of Eden Hazard, Oscar, Juan Mata, Ramires, Andre Schurrle and Kevin De Bruyne amongst the names vying for a starting role under Jose Mourinho.

"I know that I haven't secured my spot here," he told 'Globo Esporte'. "I'll do my best to achieve that place, while respecting the other players. I'll train, play and do my best to get the trust of the manager and of the fans."

Willian's transfer is subject to a work permit hearing which will take place on Wednesday this week and, provided it is granted, Chelsea will pay a fee reportedly in the region of £30million.

And, according to Sky sources, Chelsea could be on the verge of signing a second player from Anzhi, the former Barcelona superstar Eto'o.

On Friday, Chelsea boss Jose Mourinho said attacking midfielder Willian had chosen to join the Stamford Bridge club rather than Spurs.