Coach Jorge Velandia joined the coaching staff midseason. It is unclear if he will remain on the coaching staff or return to his previous role as the Phillies' special assistant to player personnel.
"It's an organizational-type thing," Mackanin said. "We feel like we need to change. We're going to look at the mix of the coaches and zero in on however we feel we can help."
Samuel said he does not want to finish his career as a first-base coach. But with Mizerock gone, Samuel could slide back to third base, where he coached for the Phillies in 2011-12.
"We're going to look at a lot of candidates and determine which is the best way for us to go," Mackanin said. "Defense and base running are important. We'll have more info on that as we look at the candidates."
Asked why Henderson and McClure have been invited to return, Mackanin said, "I like both of their passion. I think they're good with the young guys. I think we've seen some improvement with some of the guys, Freddy [Galvis], Cesar [Hernandez], even [Maikel] Franco. He's been brought along nicely. They've both had passion for what they're doing and they care about the players and their work ethic is outstanding."
Additionally, bullpen catchers Bob Stumpo and Jesus Tiamo have been asked to return.
Todd Zolecki is a reporter for MLB.com. Read his Phillies blog The Zo Zone, follow him on Twitter and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.