 Domínguez featured in all 19 games of his first tournament in Vélez, the 2009 Clausura, helping the team to claim the national championship.He was also a regular along Fernando Ortiz as centre back in Vélez' 2011 Clausura winning campaign (playing 16 games), as well as the team's 2011 Copa Libertadores semi-finalist campaign (playing all 12 games and scoring one goal).Domínguez also helped Vélez to win the 2012 Inicial, starting 18 games and scoring two goals.