The Uruguay striker scored a hat-trick in Saturday's 4-1 thrashing of West Bromwich Albion.
"What he did last season for us and what he's done already this season just shows why the club wanted to keep him so much," the Brazilian tells the Echo.
"Luis is one of the top five best players in the world and he wants to be there in the big games. That's why he's so committed to this team - he wants to put Liverpool back in the Champions League."
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