Colombian superstar Luis Diaz is capable of giving the world's best defenders nightmares.
But in the eyes of Socceroos boss Tony Popovic, that should make him the dream assignment for his understrength defence ahead of next year's World Cup finals.
Bayern Munich gun and former Liverpool winger Diaz, 28, headlines the threats posed by world No.13 Colombia in Wednesday's friendly at New York's Citi Field - one of Australia's sternest tests to date under Popovic.
