"We're in a situation now with many of the injuries that have happened and the things that have occurred this spring to try and create some roster space for us," Phillies general manager Ruben Amaro Jr. said. "That's what we've done."
The Phillies need roster spots, because they have several non-roster players in camp who are also competing for jobs, including outfielder Bobby Abreu, infielders Ronny Cedeno and Reid Brignac and pitchers Shawn Camp, Mario Hollands and Jeff Manship.
Abreu must be added to the roster by Wednesday or he can opt out of his contract. If Cedeno is not added to the roster by Tuesday, he can ask for his release, or the Phillies must pay him $100,000 to go to the Minors.
Frandsen has 72 hours to accept the assignment to the Minor Leagues, or he can elect to become a free agent and relinquish his 2014 salary of $900,000. However, Amaro said Frandsen still has an opportunity to earn a bench role with the Phillies in the final week before Opening Day, provided he chooses to remain with the organization.
"We still think he can be a valuable part of our club," Amaro said. "But he's competing. Just like he was before, he continues to compete for a job on the bench."
The Phillies say there is an open competition between Frandsen, Cedeno, Brignac and Cesar Hernandez to make the club as backup infielders.
"[We're] looking at all of them," Phillies manager Ryne Sandberg said. "This is a week to watch that and make the decisions and allow guys to play."
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.