Chelsea are joint top of the Premier League with Manchester City and Liverpool after winning six of their opening eight league games.
And on Saturday, they host Manchester United at Stamford Bridge as club football resumes after an international break.
Chelsea’s season has been spearheaded by arguably the best player in Europe – Hazard.
Hazard has scored seven goals in eight games for Chelsea but Merson feels they are too reliant on the Belgian.
“I think it would be a shock if Chelsea won the league,” he told Sky Sports.
“It’s because they are so reliant on Eden Hazard.”
Merson then claimed Chelsea defence is not good enough despite conceding just five goals so far.
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It is a season of change for Chelsea with Maurizio Sarri as the new Blues head coach.
Off the field, Italian international midfielder Jorginho completed his move from Napoli to become Chelsea’s first major summer signing, with Athletic Bilbao goalkeeper Kepa Arrizabalaga also moving to Stamford Bridge.
Now they are in the full thrust of the season and the start to the Premier League has been promising, with Sarri’s side winning six out of their first eight games, including a draw with high flying Liverpool to continue their unbeaten start.