The Spanish club lost 2-1 to PSG in the first leg of their last-16 tie at the Mestalla earlier this month.
"The tie is complicated after the first leg but in football anything can happen," he told reporters.
"We are very motivated for the game and we hope to win. We can keep dreaming because Valencia are a club that have always been there in Europe.
"It is important to look at the championship (La Liga), and to fight for a place in next season's Champions League is our primary objective."
Valencia are currently fifth in La Liga with 41 points from 25 matches, just a point off the fourth and final Champions League slot.