Watford dominated play at the City Ground, and while speculation surrounds the 20-year-old's future, Zola is confident the striker will remain at Vicarage Road.
"I am not surprised that other clubs are supposed to be interested in him because he is a fine player with a great attitude," Zola said.
"But he wants to keep on learning and I think he feels he is with the best club to do that at this stage of his career. We know that we can work with him and help him improve.
"There are still margins for him to work on but he is keen to do that because he is a very good boy and works very hard. He has a great mentality.
"We are fortunate that we have a very good partnership up front in Matej and Troy Deeney. They combine so well together and have not only produced a supply of goals but work very hard for the team.
"You could see how their link-up play worked today but as well they will point to their success as a reflection of the work that the team is doing as a unit."