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.
(Reporting by Joseph Cassinelli; Editing by Toby Davis)
