Antonio Conte’s team have brushed aside all on-comers, keeping a clean sheet in 10 of the 12 victories.
But Melchiot reckons Chelsea will struggle when their stunning run finishes.
“There is going to come a moment in every season that you have a downside”
Mario Melchiot on Chelsea
“How are they going to bounce back if something does happen to them?” he said on Sky Sports.
“Because if you’re winning all the games there is going to come a moment in every season that you have a downside.
“It could be just losing one game, two games.
“How are they going to react to it?
“But that hasn’t happened yet so let’s see.”
Chelsea take on Stoke in their next fixture this Saturday.