The France international scored the only goal of the game - a clinical finish from 12 yards - as Les Gones defeated fellow Ligue 1 side Metz 1-0 in a hard-fought last-eight match at the Stade Gerland on Tuesday.
Benzema said: "Even if a seventh title remains the priority, I hope we are going to claim the first-ever (league and cup) double won by the club."
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