The Italian moved to three at the back after the 3-0 defeat against Arsenal last September, with the switch leading to an upturn in results that drove Chelsea to the Premier League title.
Despite its success, Spanish defender Alonso revealed Conte is trying alternative options for the upcoming 2017/18 season.
“We are working on new things this year to improve as a team”, he said.
“It’s an old Italian system that worked very well last year. It’s normal that other teams are trying to play like this, depending on the players you have. It’s good to play in different ways.
“Football forgets everything very quick. It’s already time to think about the next season and do better than last year.”
With Chelsea defending their Premier League crown next season, Alonso is aware of the threat that their big-spending rivals could pose.
“It’s been a crazy summer,’ said Alonso. ‘Teams are spending big money, compared to other years. It’s getting more and more expensive with time.
“If they have the money they can do whatever they want. We need to be ready to play against every team.”