Valencia went without swinging for three days, then took some swings on Wednesday and was to take some more cuts on Thursday.
"We'll see how he feels tomorrow," manager Ned Yost said.
Yost still wasn't ready to announce who will start Saturday's game against the Blue Jays in place of Yordano Ventura, who's been skipped as a precaution because of elbow issues in his last start.
Dick Kaegel is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.