The 17-year-old, whose preferred position is as an attacking full-back, has signed on an initial season-long loan.
"It is fantastic to be here, it is like a dream," Ferrari told whufc.com. "I am very happy to be in London. I am privileged to train under Gianfranco Zola as he is one of my idols.
"I like to attack as a full-back and I like to score goals but first my main aim is to be in the first-team squad and to do well for the club."