De Zerbi has been linked with Barcelona in the past.
"The contract is never of great interest to me," he told La Gazzetta dello Sport. “But if you don't have a contract when you have to make plans, it's clear that other scenarios can come up.
“I work as if I had a 10-year-long deal. In two years, the players have developed. The team are strong and could become even stronger. Then you have to look at the club's plans.
“If I get an offer from one of the big clubs, I will consider it and check if there are the conditions to work well.
“I am ambitious but not a careerist. I was ready two years ago. But it's also true that I have a lot of fun training these players here."