Xabi Alonso misses out tonight after picking up his second yellow card of the campaign in the first leg so he is aware of the risk the five must take.
He said: "It is important they take care. It will be a disaster if one of my team-mates is forced to miss the final.
"They must block it out of their mind and not think about it. They must try and play their natural game.
"They must take some risks because if they are too cautious it will be difficult for the team to win, but they must also be careful at the same time."