The Frenchman refuses to give up hopes of surviving the play-offs, irrespective of his side's home-defeat last week
Lille coach Rene Girard is confident his side can reach the Champions League group stages at the expense of Porto.
The Ligue 1 side were beaten 1-0 by the Portuguese giants in the opening leg of their play-off last week, with Hector Herrera's 61st-minute strike the difference in France.
Lille, though, were handed a much-needed confidence boost on Saturday as they accounted for Lorient 2-0 and the win should hold the French club in good stead at the Estadio do Dragao on Tuesday, according to Girard.
"We know what we have to do. We lost 1-0 at home, so let's be effective," Girard said at a press conference.
"I have confidence in my group. We will have to be 150 per cent for a successful outcome. Our victory against Lorient brought more confidence.
"We know that we have a difficult task ahead. But we are competitors and will not let go of anything.
"We could have done better in the first leg, but we had a big calibre opponent.