Willian doesn't expect to be walk-up starter at Chelsea.
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.
"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 hopes his move to the Premier League will boost his chances of making Brazil's squad for next summer's World Cup.
"There is no doubt English football is very big, with huge visibility," he added. "I hope that helps me to be called up for the national team - but of course that depends on me.
"I'll have to play and prove I deserve that spot. I first have to become a regular starter [with Chelsea], then play well and be called up [by Brazil]. This is my goal."
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