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The first leg encounter is at Stade Pierre-Antoine on Friday night and the giant Australian international lock knows that it will be vital to go into the second leg 15 days later at Stade du Hameau with potential victory in their sights.
"It's really important to win matches again after our play-off defeat," said the 6'7" Morgan.
"Castres are a good team and will be sure to be up for the occasion. We are totally committed to going as far as possible in this competition - to win a title at the end of the year would be great."
With the final forming part of a double-header with the final of the PARKER PEN CHALLENGE CUP at the Madejski Stadium, Reading, on Sunday, 25 May, Pau, Castres Olympique, Caerphilly and Petrarca Padova can all see a prestigious occasion in their grasp.
"We will put everything into these two matches and try to reach the final," said Castres Olympique coach Christian Gajan.
"Pau are a big team involved in the play-offs but we are very motivated and will select our strongest available team. It is not ideal playing home in the first leg but you have to adapt to the tournament and our priority is to at least reach the final."
Jean-Louis Luneau, the Pau coach, added: "All rugby matches are there to win and we need to get a win or a very good score against Castres on Friday night to set us up for the return match.
"We will put everything into these matches, as we always do with our European
competitions."
