The 3-0 victory pushed Chelsea up to third place, just seven points behind leaders Liverpool. 
"It's important we use Zola very well, as he starts a new attack every time he gets the ball," said the Chelsea manager.
"He plays for the team and is always in the best position to receive the ball and pass it on quickly."
Ranieri added that the club's target for the season was a place in the Champions League.
"Our target is to be in the top four places at the end of the season. Now it's important we continue to work hard in our training sessions.
"The first 30 minutes were terrific for us, touching and moving the ball very quickly and with two great goals from Gudjohnsen.
"I'm very pleased with our attitude and performance. And it was important for our confidence that we won this match."