Chelsea still progress 2-1 on aggregate, but Terry was unimpressed.
"It was disappointing, the way we started, but we're delighted to go through," Terry told ESPN.
'"We left it as late as we could as sometimes that's the best way. It wasn't our best performance but we're in the next round and we're happy with that.
"It was a great goal from Eden. The manager's rested a couple and to have the likes of Eden on the bench is great. When he came on he showed great sharpness.
"But they had two counter-attacks in the last five minutes and that's not good at all. We're disappointed with that. It's not the best but we're through."