The Hoops were beaten 3-0 at home by the Italian champions in the Round of 16 first leg on Tuesday night but the centre-back is not giving up hope, especially after Liverpool came from 3-0 down at half-time to beat AC Milan on penalties in the 2005 final in Istanbul.
"You have got to remember anything can happen in football. I don't think the tie's over yet. If you say yes, then it's a waste of time even going over there," he said.
"Look at Liverpool. They were 3-0 down in the final and came back to win it. That was against a great Milan side.
"It's going to be hard, we are not stupid. But we're not going to write it off either.
"I think the Barcelona game can inspire us, although we can't keep living off that one.
"We just need to do something over there now. It's going to be tough, but we'll have a go.
"It will without a doubt require one of the club's greatest-ever performances to turn this around, especially at their place.
"We have a mountain to climb now. Going out there trying to score three goals, it's going to be hard. But we'll do all we can."