The Belgian goalkeeper made his long-awaited return from injury in the 1-0 defeat to Bournemouth on Saturday and is now looking for some positivity at Stamford Bridge following a poor recent run.
"Of course we are upset, but we have to regroup again and show strength against Porto in the Champions League and next Monday at Leicester," Courtois told the club's official website.
"It's an important week for us. On Wednesday we have to win to make sure we are first and qualified. That will be a big boost for the team as well.
"Then Leicester away is a difficult game. We knew last year it was not easy there and now they have the confidence and are playing really well. It will be a very tough game but we are confident we can push on there."