Chelsea are two points behind Premier League leaders Manchester City after beating Crystal Palace 3-1 at Stamford Bridge on Sunday.
A brace from Alvaro Morata and a goal from Pedro helped the Blues beat the Eagles.
Asked if Chelsea can keep up with Manchester City, Chelsea boss Maurizio Sarri said: “I don’t know.
“We know very well there was a gap and now we need only to try to think to cover the large part of this gap.
“I hope to cover almost all the gap, but I don’t know. It is hard to cover 30 points in 6 months. But we are trying.”
Sarri also revealed Manchester City and Liverpool are still ahead of Chelsea in the race for the Premier League title. Liverpool are third, behind second placed Chelsea on goal difference.
“From the first day, Manchester City and Liverpool are at the moment a step ahead of us,” Sarri added.
“When I arrive the gap from last season is 30 points with City.
“It is difficult to think you can recover this gap in one season, in six months.
“We need to improve more because we are doing well.
“We need to improve from a tactical point of view.
“In the first 15 minutes of the second half we were not compact.
“In the defensive phase we need to improve.
“When we can’t cover the ball in the opponent’s half we are in trouble. So we need to improve.”