"We're going to go ahead and take the precaution," Porter said.
Meanwhile, second baseman Jose Altuve started at designated hitter. He's not quite over the soreness in his left quadriceps muscle, so Jake Elmore started at second base Sunday. The Astros are off Thursday and can give Altuve another day of rest.
"He's been doing much better and [we] want to continue to monitor him," Porter said.
Brian McTaggart is a reporter for MLB.com and writes an MLBlog, Tag's Lines. Follow @brianmctaggart on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.