"I do not know yet," Amaro said before Tuesday night's game against the Angels. "He did see our doctors at Rothman Institute. They are going to have to operate on him and put some kind of plate in there. So it's going to be a ways; it's going to be a long time unfortunately."
The Phillies recalled infielder/outfielder Cesar Hernandez from Triple-A on Tuesday to take Nix's spot on the active roster. Utility infielder Reid Brignac replaced Galvis on the roster on Friday.
Phillies management stressed defense and versatility with the infield when finalizing their Opening Day roster, which meant parting ways with infielder/outfielder Kevin Frandsen at the end of Spring Training. Amaro said he had no regrets about that decision.
"No, not at all," Amaro said. "Because there is a reason why we decided to part with him. We have our reasons. We'll go from there."
Nix, who essentially replaced Frandsen, was acquired in a trade with the Rays on March 28. Nix hit .154 in 18 games with the Phillies before being outrighted on Monday. He elected to take his free agency on Tuesday.
"We're just trying to improve our club," Amaro said. "My job is to do what I can to improve the club. If guys aren't doing their jobs ... the key is trying to replace them with someone who you think will be better. People talk about, 'Well, let's get rid of this guy.' But you also have to replace him with someone who will actually be able to do that."
Austin Laymance is a reporter for MLB.com. Follow him on Twitter at @jalaymance. This story was not subject to the approval of Major League Baseball or its clubs.