Zola is in his second management post, having been sacked at the end of the 2010 season by West Ham.
He told the Mail on Sunday: "I am not a guy who can hold grudges,' he said. 'West Ham was a difficult experience, tough for somebody like me in his first job. I was managing a Premier League team with a lot of responsibilities. I knew how to handle the players on the pitch but outside the pitch is quite different. I made some mistakes but I think I did a lot of good things.
"I took the hard road, but the experience I have from two years managing West Ham is worth five, or more, years of normal experience."