Despite the striker's struggles at Stamford Bridge he expects him to rediscover the form which made him one of the most deadly strikers in the world at his peak.
"He is the same player but it is a different team so it is difficult to judge (how he compares to his best form for Liverpool)," said Reina.
"I think there are a lot of periods when goalscorers' lives are like that. Sometimes you do it, sometimes you go through bad spells but Fernando does know how to score and is a very good player.
"With Juan Mata (another international team-mate) behind him he will deliver more goals and will be better.
"He (Torres) is such a good player and he will be a real threat for us - not just him because they have a lot of good players that can create us problems.
"It is going to be a tough game. We have to do things right and hopefully we will take three massive points."