The Liverpool midfielder was left frustrated with their second-half fade-out.
Gerrard said: "There is an element of frustration there but this result is not the end of the world. It is still in our hands.
"We are disappointed with periods of the game but we are also very happy with the first-half performance. If we can get that for 90 minutes, we believe we can still qualify.
"We will have to wait and see how the other teams do in their fixtures but we are more than capable of winning the last four matches."