As well as Benzema, Lyon will trouble United with the pace, trickery and guile of another 20-year-old, Hatem Ben Arfa.
Less prolific than Benzema in front of goal, Ben Arfa is a player who France Football journalist Xavier Rivoire says "is a winger rather than a centre forward - and can create things out of nothing".
"His greatest asset is his dribbling ability. His crossing is also good. He has all the trickery of Cristiano Ronaldo. He is a little pest when he has the ball at his feet. He is highly skilled, technically, and can be spectacular to watch."
Ben Arfa has scored twice in six Champions League games.
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