Watford's longest-serving player, defender Lloyd Doyley, says a "new era" has begun at the Championship club.
Doyley told BBC Three Counties Radio: "It's a new era. There has been a lot of change, but everything is going well, it's pretty positive.
"He [Zola] has a different philosophy of the way he wants to play."
The 29-year-old added: "We're trying to keep the ball a little more. We're adapting to it and we're trying to strive forward."
Doyley has spent his entire career at the Hertfordshire club, 10 years as a professional, and on Sunday he will play in his testimonial against Tottenham Hotspur.
"It's a very big game for me personally," he added. "I've been here since I was 11 years old so it will be good to say thank you to the fans."