Antonio Conte conceded his team is facing many difficulties and has not settled yet after Saturday's 3-0 defeat to Arsenal in the 2016/17 Premier League.
After collecting only one point in their last two league games, Conte's men were handed another thrashing at the Emirates Stadium. Chelsea were two goals down in the first 15 minutes of the game after Alexis Sanchez and Theo Walcott gave the Gunners the upper-hand.
Gary Cahill looked clueless in the opening minutes of the game as he lost the ball easily at the back to let Sanchez open the scoring in the 11th minute. After Walcott's strike, Mesut Ozil made it 3-0 before the break. The Blues were never able to recover from the deficit and succumbed to their second straight league loss of the season.
Chelsea hardly had any defensive discipline in their 2015/16 league campaign in which they conceded 53 goals and finished 10th. They have already conceded nine from six games in the ongoing season.
Heading downwards towards the bottom half of the Premier League table, Chelsea have struggled to maintain composure at the back after losing John Terry. The 35-year-old was sidelined following an ankle injury he picked up during the game against Swansea City on 11 September.
Conte wants his men to keep in mind their disastrous last season and not repeat the mistakes which led to their downfall. He says he does not want to focus on individual errors but wants the entire unit to perform to its potential.
"I think from the first minute we didn't have the right attitude. I think we played a bad game against a tough team, very organised, very prepared in the tactical physical aspect," Conte told BT Sport, as quoted by ESPN.
"I think that after today we are thinking that we must work a lot, because now we are a great team only on paper.
"I don't want to talk about the mistakes because it's not right for the player.
"We win as a team, we lose as a team. We know we must work a lot and if someone thinks this team now is ready to fight, I think we must wait and work to improve a lot and to come back a great team not only on paper, but on the pitch."