Arsene Wenger has warned Chelsea that their inability to finish off Arsenal in the first leg, may come back to haunt them.
Chelsea took the lead in the first leg but missed chances to extend their advantage, before Robtert Pires levelled the scores.
“They could have taken advantage of the few minutes after they scored but the fact that we survived that period could be vital on Tuesday,” he said.
“I was happy with the 1-1 draw as we were 1-0 down and we didn’t create as many chances as we often do.
“It is important to have scored away as, with a 0-0 draw, we would qualify.
“But it’s a massive game as there’s a semi-final place in the Champions League at stake.
“Our tradition is to go for it and I feel that Chelsea will try and score goals too. Despite the fact it’s a derby and was a draw in the first leg, it could be an open game.”
The winner of Tuesday’s game will face either Real Madrid or Monaco in the semi-finals