Benitez revealed that he was aware of the prolific Argentinian before he moved to Spain but missed the chance to snap him up .
Benitez 's newcastle side face the Argentinean and his team - mate in a crucial clash tonight .
Benitez , whose Newcastle side face the Argentinean and his team - mate in a crucial clash tonight , revealed that he was aware of the prolific Argentinian before he moved to Spain but missed the chance to snap him up .