The Phillies also announced that second baseman Chase Utley, who left Wednesday night's game after getting hit in the helmet by a pitch, did not accompany the team to Milwaukee. Utley will be examined by Dr. Rob Franks, a concussion specialist at the Rothman Institute.
Philadelphia likely would've waited until next week to activate Rollins if not for the uncertainty surrounding Utley, but the infielder will be on hand as a reserve on Wednesday night. Rollins is not expected to start Wednesday but will be available in case of emergency.
Rollins, who will be a free agent at season's end, has spent his entire career with the Phillies. The 2007 National League Most Valuable Player Award winner has started at least 100 games for Philadelphia in 10 of the past 11 seasons, and reserve Wilson Valdez has filled in at short in his absence.
Rollins, a three-time Gold Glove-winner, has made just five errors in 119 games at shortstop this season. The three-time All-Star hit .268 both before and after the All-Star break, but he's hit six home runs in 34 games since the intermission after only hitting eight in 87 first-half games.
Spencer Fordin is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.