Liverpool defender Andrew Robertson was relieved after their 2-0 win at Inter Milan.
The Reds won the first-leg of their Champions League round 16 tie 2-0 in Italy.
Robertson said: "We must be better than we were tonight if we are to secure a place in the quarterfinals.
"But we have the advantage of having scored two goals. If we do not deliver a good performance in the return match, we will not move on.
"Inter are fantastic and they will create problems for us at Anfield, so we have to play to our best."