The Blues finished fourth last season but have been tipped for a title challenge after spending more than £200m and bringing in the likes of Timo Werner and Kai Havertz.
Chelsea are currently seventh in the table, having won two of their opening four games of the season.
Discussing Chelsea’s transfer window and their chances of winning the Premier League, Zola told Sky Sports: ‘They have spent a lot of money and I believe they have spent it well.
‘They have brought in quality players, young players so they have a big future in front of them.
‘Now it will be blending them into the team that was already there and making a winning team because that is what is going to make the big difference.
‘Chelsea have a lot of young players in the squad and you can see something big and important coming up so I really hope this is going to happen.
‘Competition is very strong as you can imagine, it’s not going to be easy to get to the level of Liverpool or Manchester City.
‘Their platform is very high at the moment, but if they work well they have the quality in the team to also reach those levels.’
Zola – who spent seven years at Chelsea as a player and worked as Maurizio Sarri’s assistant at Stamford Bridge – also revealed he feels ‘sorry’ for Kepa Arrizabalaga.
‘Knowing Kepa, I am sorry for this situation,’ Zola added. ‘He’s a good boy and a good player.
‘When he arrived he came with a goalkeeper with a lot of potential but with a big burden with his massive price-tag. Now he seems like he’s not secure and he feels weak.
‘I feel sorry because this is not the real Kepa. He’s feeling the pressure and making mistakes but the potential still remains.
‘I think he can become a top goalkeeper. I think he has showed that. It depends on what Frank wants to do.
‘Right now, you can see the player is not comfortable and feels insecure. That is not good. But it depends on what Frank and Kepa want to do.’