"We've got to be confident. We've got a big, strong squad and the players have proved over the last few years that we are very good in this competition, so we will still have the confidence," the vice-captain told the club's official website.
"We know it will be difficult but it's up to us now to show the character and the quality to go through.
"We are making it tough for ourselves but there's still four games in which we can get enough points.
"We didn't play well tonight, we weren't at our best and credit to Marseille because they played well. They deserved to win.
"Towards the end was probably the only time we put them under pressure."