The Chelsea legend was appointed the Hornets boss in the summer following the Pozzo family's takeover of the club.
"[I joined] for two reasons - England and the project," Zola told La Gazzetta dello Sport.
"My family wanted to come here, we have always been very comfortable. I like the ideas of [Giampaolo] Pozzo. He wants to create another Udinese here in England.
"They have asked me for a season of adjustment. We will aim for a place in the playoffs and promotion next season."
Watford have picked up six points from four matches in the Championship so far this season.