Arsene Wenger is confident Arsenal will reach the Champions League knockout phase despite having two men sent off in the 1-1 draw with PSV Eindhoven.
Lauren and Patrick Vieira were both sent off and will miss the final game against Rosenborg at Highbury.
Arsenal will qualify if they win and Wenger said: "It's a big blow to lose these two, but we will compete well and I think we will win this game.
"We defended well, and you are happy with a point when you have nine men."
Wenger revealed goalscorer Thierry Henry is a doubt for the game at Liverpool on Sunday after aggravating an Achilles tendon injury.
He said: "Thierry cannot walk very well at the moment and we will have to wait until Friday or Saturday to know who will play at Liverpool."
Arsenal are also likely to be without Robin van Persie, who was stretchered off with a knee injury.
Wenger said: "With Van Persie we don't know yet if it is a kick or a twist. My feeling is that it was a kick, so I'm quite
optimistic but we will not know for 24 hours."
Arsenal conceded another goal from a set-piece, with Andre Ooijer heading home from Marc van Bommel's corner.
Wenger said: "We are normally strong in the air, but I felt we were not properly into the game when they scored.
"But I felt we were the better team and created the better chances. I am very confident we can still win the group and that's what we want to achieve."