Infante did begin a throwing program last weekend.
"He's extending it and he's progressing," manager Ned Yost said. "We'll just have to keep checking on how he's doing and when he'll be ready."
The Royals, though, are less than three weeks away from Opening Day and need to know if Infante will be ready by then.
"We're getting to the point where we have to see him in a game [defensively]," Yost said. "That needs to happen within a week or so.
"If we can get him in 10 games or so down here, that should work."
Jeffrey Flanagan is a reporter for MLB.com. Follow him on Twitter at @jflanagankc. This story was not subject to the approval of Major League Baseball or its clubs.