The Brazilian, whose side come into the semi-final second leg having put four goals past Brighton & Hove Albion, has said that his side are strong contenders for a place in next month's final.
"I hope we can do something special to win," Willian told the Evening Standard. "We have quality players who can do something different. Everyone has to be ready.
"It's not just the Chelsea fans who don't like losing to Arsenal. We, the Chelsea players, don't like losing to Arsenal either. We are going into this game very strong.
"This is another big game, another part of our history against them. "It is always difficult to lose a final like we did in the FA Cup."
Willian was on the scoresheet at the weekend against Brighton alongside Eden Hazard, who found the net twice.