The Reds have only one point from their three games.
Reina said: “It’s going to be hard and it’s going to be tough and we know that.
“We know we have to win all three of our remaining games but the most important one is the next one.
“We need three points because Besiktas are ahead of us, even in the fight for the UEFA Cup. We have to beat them at home and get ahead of them at least.
“I don’t know what’s gone wrong. Against Besiktas we have conceded two goals from four shots on target — but could only score one from 10. What can I say? If we are going to get out of this group, then first we have to beat Besiktas at home. I don’t want to think we will go out. I want to think that we are still in there. We have three games ahead of us and we have to be positive.”
