"We know whoever we get in the next round will be really tough but it will also be exciting," said the Basque.
"You can see the teams who will be involved and how strong those who finished in second are.
"We'll have to be ready. Real or Barcelona could be the next game, but we've played a few games in Spain in the last few years and always won there, so if we meet either of those clubs we'll know it will be a massive game for the club, but we'll see.
"When we won in 2005, we were never favourites in any game we played, and depending on the draw that maybe the case again, which could suit us.
"It was definitely good the year we won it when everyone thought we would lose to Juve and then Chelsea and Milan. I hope that would be a good omen for us."