Dominguez took a ground ball off his thumb during infield drills on Friday. An X-ray came back negative. There is no fracture or ligament damage.
Keeping Dominguez out of Saturday's game is precautionary, and he should be back in games in a few days.
A first-round Draft pick in 2007, Dominguez has dealt with adversity this year. The California native sustained a left elbow fracture shortly before the 2011 Minor League season started.
Dominguez has played in 16 Arizona Fall League games with the Surprise Saguaros, batting .203 (13-for-64) with three home runs and 13 RBIs. One of his home runs in the AFL was a grand slam.
Dominguez went 1-for-4 on Thursday night.
A slick fielder, Dominguez is regarded as the Marlins' third baseman of the future. Defensively, he is considered above average. To be big league ready, he is working on being more consistent at the plate.
He batted .258 with 12 home runs and 55 RBIs in 87 games at Triple-A New Orleans.