The Portuguese team has some good players like Cardozo (who is also their goalscorer), Saviola, Aimar or Di Maria. They will win the Portuguese Liga and hope to achieve the Europe League Final. I think they have the strength to score in this game, and I hope they won't play too cautious.
Liverpool seems to be back in the card for the 4th place in Premier League, and they want to win the Europe League as they need a trophy after a few your without any. Torres is playing great, Gerrard and Maxi Rodriguez are playing very well together and give Torres a lot of useful balls. Mascherano is doing great job as a defensive midfielder, and the defense which can be improved has less worries.
I think that Torres will continue to score, and I see here at least 3 goals in a spectacular game. Every team can win this game with a little bit luck. In the second round I will expect a win for Liverpool and maybe a qualification.