Newcastle midfielder Marveaux adamant Euro tie not over
Newcastle can reach the Europa League semi-finals with a 2-0 win, but if Benfica score they will require four goals to go through in normal time.
And that means they won't be going gung-ho against the Portuguese league leaders, who are unbeaten in all competitions since October.
Marveaux said: "Hopefully, we can score quickly and then it will be a different game, but we know we can't afford to concede.
"I believe we have the quality in our side to beat Benfica but they are a very good team so we have to be solid."