The hit would drive in Jordy Mercer, who had singled and Adam Frazier, who was on base after being hit by a pitch. The two RBIs cut the Reds' lead to 7-6.
Harrison was tended to by trainers out at second base and walked off the field under his own power.
Pirates manager Clint Hurdle had no news on Harrison following the game.
George Von Benko is a contributor to MLB.com and covered the Pirates on Saturday. This story was not subject to the approval of Major League Baseball or its clubs.