Benfica and Barcelona are offensive minded sides and I expect overish game here.
Another reason for that over is that both sides are gonna miss their captains and key defenders , as Luisao is suspended for the hosts, while Puyol is injured.
Benfica made goaless draw agaisnt Celtic and will search another points tonight, having home advantage and their crwod behind them. Anyway they are not having solid defense lately, as the team concedes goals and won only 3 of their 7 official matches.
Barcelona is far from their high flying form from last season and the team struggles lately, conceding a lot of goals aswel, but managing to win with late goals. They made goal festival against Spartak Moscow at home, and also managed to comeback against Sevilla last weekend in Premiera from 2;0 up to 2:3 win.
I expect fast and aggressive football with minimum 3 goals.