Terry demanded more "fight and desire" from his Stamford Bridge team-mates.
"Let's not beat around the bush," he wrote. "No wins in six games is simply not good enough and, since I have been here, I have not experienced a run like this.
"We, as players, have to stand up and take responsibility - stand up and stay together.
"We demand a lot of ourselves and we have to focus on rediscovering the winning habit."