Darwin Barney was removed from Saturday night's Triple-A Albuquerque game in the third inning, so he seems to be the most likely replacement. Isotopes infielders Carlos Triunfel, Erisbel Arruebarrena and Alex Guerrero are also on the 40-man roster. Barney has the most big league experience, Arruebarrena is the best defender at shortstop and Guerrero the better hitter.
Ramirez, eligible for free agency after this season, has been determined to stay off the disabled list this year despite shoulder and calf injuries. Nonetheless, he has missed 25 starts.
Miguel Rojas, who replaced Ramirez on Friday night after one-half of an inning, started at shortstop Saturday night.
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.