Chelsea captain John Terry has warned the rest of Europe that his side have plenty of improvement to come this season.
The Blues are at the summit of the Premier League and have secured top spot in their Champions League group, with Terry expecting even better things to come.
He said: "We haven't hit top gear in Europe yet. There is still more to come from us.
"The momentum, the way we're playing and the confidence can only take us in one direction and that's forward.
"We can work better and will find solutions from where we've gone wrong.
"We will regroup after the group stage and look forward to the draw, although it looks like there could be a difficult draw because there will be a number of big teams finishing second."
Chelsea have taken 13 points from a possible 15 in Champions League Group D, with their only dropped points coming in a 2-2 draw away to Atletico Madrid.