"He drew quite a crowd," Showalter said. "He's on a five-man [rotation] program. He's doing well."
Santana missed the entire 2013 season after undergoing his second shoulder surgery in three years. A two-time Cy Young Award winner, Santana last pitched in the Majors in 2012, going 6-9 with a 4.85 ERA over 21 starts with the Mets, while also throwing a no-hitter.
Paul Casella is a reporter for MLB.com. Follow him on Twitter @paul_casella. This story was not subject to the approval of Major League Baseball or its clubs.