The Brazil international attracted plenty of interest during the last transfer window, with a number of clubs in England reported to be chasing his signature.
Chelsea, in their pursuit of creative talent, led the hunt, but failed in their efforts to take the Samba star to Stamford Bridge.
Willian was disappointed to see Shakhtar block a deal, but understands why there were so keen to keep him and believes he will grace one of Europe's top divisions at some stage in the near future.
He told ESPN.com.br: "My goal is to play for a bigger club in a high level league."
On Chelsea, he said: "If I tell you that I was happy, I would be lying. My desire was there, with a €25million (£20.3m) offer from a big club like Chelsea. I wanted to pack my things and go, but I can't do that as I am under contract.
"It shows how much Shakhtar like me and shows that I am doing a good job, which is why they wanted me to stay.
"I have tried to convince them many times to let me go. I know that Juventus and Chelsea have made offers to buy me and that motivates me a lot.
"The club know that I want to leave, everyone knows that. The president has told me that he'll let me go for €30million (£24.4m) and my intention is to sign for a big club."
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