The Reds have work to do in the second leg of the Champions League last 16 tie against the Greek champions after falling to a tame 2-0 defeat in Athens.
"We know we didn't play a good match in Greece," the goalkeeper told UEFA.com. "They were better than us and they won.
"But now there is the return leg at Old Trafford and I think that, with our fans behind us, we have to go onto the pitch and fight and attack from the first minute. By playing and pressing well, we still have a good chance.
"We will give everything we have and play a lot better than we did there. With the atmosphere and the team we have, we can succeed and hopefully reach the next round."
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