The 34-year-old appeared to appeared to mimic Atletico boss Diego Simeone, who turned to fans and grabbed his crotch during his side’s 2-0 first-leg victory.
Cristiano Ronaldo scored a hat-trick in the return leg as Juventus won 3-0 against Atletico Madrid in the Champions League.
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Uefa will rule on the case on 21 March.
Recall that Diego Simeone was fined 20,000 euros (£17,000) for his celebration.