The Blues lost ground after Kevin De Bruyne‘s winner gave City a 1-0 win at Stamford Bridge.
Boss Conte admitted: “I see the commitment every day but to defend the title, to win two titles in a row, is very difficult.
“Our motivation has to be high in every competition, to do the best in every game. Sometimes you must accept it will not always go to plan.”
The Italian added: “That was a completely different situation.
“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.”