Ronaldo, who scored a hat-trick as the Italian champions overturned a 2-0 deficit from the first leg to win 3-2 on aggregate against Atletico, gestured towards his groin with two hands.
Atletico coach Diego Simeone had celebrated in a similar way after his team's opening goal in the first leg in the Spanish capital.
The Argentine coach was fined the same amount by UEFA’s Control, Ethics and Disciplinary Committee.
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(Reporting by Joseph Cassinelli; Editing by Toby Davis)
