The first leg of the match ended in a 2-2 draw, and Dominguez played down the importance of the result in a second leg that will be watched around the world. River Plate won 3-1.
The second was transferred to Madrid because of fan violence in Buenos Aires.
In a game that was delayed and then moved to Madrid following an attack on the Boca bus last month, River won the second leg 3-1 after extra time on Sunday to claim a 5-3 aggregate success that earned them a fourth Libertadores title.
But there were ugly scenes back in the Argentine capital as fans clashed with riot police in the early hours.
"That's the only thing that makes me feel bad - not bringing the cup to Boca".
Messi was one of a number of high-profile figures in attendance for one of the most exciting finals in the history of the competition.
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Gonzalo Martínez hit the nail in the coffin after scoring a third for River Plate. "Hopefully these things will not happen again".
It meant that instead of a home game with the exclusive presence of River supporters, Real Madrid's Bernabeu was equally-divided between fans of both sides, a highly unusual situation in the Copa Libertadores, South America's equivalent of the Champions League.
CONMEBOL had already decided that beginning next year the Copa Libertadores final will be played in a neutral site with a single game, with Chile hosting it in 2019.
"Not everybody is violent in our society, it's just a small group", Biscay said.
"I think that I gave the fans what they deserve and it is everything that they believed in me". But this provided the opportunity for the European-based players of other clubs to turn out in force.