Diego Simeone has labelled Cristiano Ronaldo as "an amazing player" but warned his Atletico Madrid squad that Juventus also boast plenty of quality as a collective.
Former Real Madrid forward Ronaldo has scored 25 goals against Atletico in all competitions, including a hat-trick when the sides met at the last-16 stage in the 2018-19 season.
The Portugal international drew a blank in the reverse fixture two months ago, though, and has struggled for fitness in recent weeks, making him a doubt for the midweek clash.
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Simeone acknowledges the unique talent Ronaldo possesses but is also wary of Juve's overall strength as a unit.