"It just kind of tightened up a little bit when I stretched out the double last night," Nix said. "I wasn't too concerned about it, just something that was there and was a little bit sore after the game. It's a little something that kind of started, so we're going to keep it under control."
Alberto Gonzalez replaced Nix in the lineup and at shortstop for Tuesday's game, though Nix believes he will be able to play on Wednesday. The bench will be composed of Nix, catcher Austin Romine and outfielder Vernon Wells.
For the time being, Girardi envisions using Gonzalez at shortstop and David Adams at third base. He said that there is no plan yet in regard to Ivan Nova, who is being carried on the roster as a 13th pitcher.
"It's not what you want," Girardi said. "It just tests your depth even more, but it's something we've had to deal with, and we'll deal with it."
Bryan Hoch is a reporter for MLB.com. Follow him on Twitter @bryanhoch and read his MLBlog, Bombers Beat. Kelly Erickson is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.