The Blues have struggled in the opening few months of the new campaign after clinching the Premier League title in 2014/15, prompting questions of their desire.
Ahead of Wednesday night's Champions League group stage clash with FC Porto, Courtois made it clear that all the Chelsea players are completely committed to the cause as well as under-fire manager Jose Mourinho.
"Who says we don't have the same commitment?" asked Courtois.
"Results don't say we are not committed to the manager. Sometimes we have been better than other teams and still lost. That doesn't say anything about our commitment, results are just not there.
"We are still confident in the manager, we are one team, and we are trying to get out of it with him.
"It's easy to say it's only the manager but every player, every member of the technical staff, has to get better and then we will be near the top again."