Carlo Ancelotti believes Chelsea can still enjoy a "fantastic" season despite recent poor form.
Saturday's 3-3 draw at home to Everton came off the back of a Carling Cup exit at the hands of Blackburn Rovers, a 2-1 defeat to Manchester City and a 2-2 Champions League draw with Apoel Nicosia.
The Blues sit three points clear at the top of the Barclays Premier League, however, after Manchester United's 1-0 home reverse against Aston Villa.
Ancelotti is worried about his team's current tendency to concede from set-pieces but sees plenty of room for optimism despite some indifferent form.
"I am working with fantastic players and we have a good opportunity to have a fantastic season," said Ancelotti.
"But we have to improve on the set-plays because we conceded three goals from them. It was the same against Aston Villa. We lost that game on set plays but we worked on the situation and we improved. We have to do the same now.
"For these particular situations, we have to find better positions in the penalty box and continue to work.
"We went 10 games without conceding a goal at home and we then concede three. We must stay calm and quiet and continue to play."