No team has retained the top-flight trophy since Manchester united won it three times in a row from 2006 to 2008.
Conte won three successive Serie A titles as manager of Juventus, but is already finding it harder to try to repeat last season’s heroics than he did in Italy.
“I see the commitment every day, but for sure to defend the title is very difficult.” he said.
“It is very difficult for every team in this League.
“To defend – it is very difficult to win two titles in a row.”
Chelsea’s rivals all strengthened their squads significantly over the summer, quite the opposite to what Conte experienced with Juve.
“We won the title with Juventus and I was expecting a really strong challenge from AC Milan,” he said.
“But instead they sold Zlatan Ibrahimovic and Thiago Silva to Paris St Germain, so they became weaker.
“It wasn’t simple second time, but it was easier.
“Here, from last season to this season, you have big teams and now they are bigger.”
Chelsea had no Champions League football to distract from their domestic challenges last term.
But Conte was quick to downplay suggestions that playing just once a week enhanced their chances to a large extent.
“I think last season we did a really great job, because we won the League against a really strong team, because Man City last season also was a fantastic team,” he added.
“And now after I think a great transfer market, they have improved a lot. It’s not simple to play this League.
“We have to try to do our best in every game with great ambition, because we must always have the right ambition.
“But at the same time sometimes you have to compliment your opponent. You must be honest and accept the result.”