The 28-year-old is set to leave the Russian side when his contract expires at the end of this year.
Espanyol have previously hinted that they would be keen to sign Dominguez as a replacement for Raul Tamudo.
“Playing in Spain would be fantastic, and Espanyol would be a magnificent option,” Dominguez told Sport.
“I know that their coach is from Argentina, and that helps.
“I have no news now, and although there is not a lot of time left for me to decide, I am focussed on finishing this season as strongly as possible.
“Clearly I would love to play in Spain because, despite speaking Russian, it has been difficult at times.”
“When I reached an agreement with Rubin it was set out clearly that I would go at the end of the year,” he continued.
“They know that and have accepted it and have not applied any pressure on me. That is why I am determined to give the club everything I have.
“Even if we won the league again I would not stay because I have spent six years in Russia and I have completed my time and feel very proud.”