Belgian Courtois has admitted that, while it will be tough to overcome Manchester City to retain their Premier League crown, Antonio Conte's side must be in a position to pounce.
"It's important to try to keep on winning and pushing forwards," the stopper told Chelsea TV. "At the moment City is winning. They are far ahead. But you never know in football. You can have a bad month, three or four games you lose, you lose points.
"We have to be there winning our games, to maybe have a little chance. The season is still long. Our main goal, if we cannot be champions, is to be second. We have to keep on winning.
"It's important to win in the League Cup, to go through to the semi-final. The FA Cup will start in January. Champions League we have a tough draw against Barcelona. We have chances to win and go further as well. We still have a pretty busy season."
Chelsea go up against Bournemouth in their EFL Cup quarter-final tie, before travelling to Everton on Saturday.