FORT MYERS, Fla. -- At this point, the only thing certain about the Boston Red Sox roster is that it won't be finalized until Sunday afternoon.
Manager John Farrell confirmed Friday morning that outfielder Daniel Nava, first baseman/outfielder Mike Carp and reliever Clayton Mortensen are on the 25-man Opening Day roster, but would not make any definitive statement about outfielder Jackie Bradley Jr.
Why the holdup on Bradley? The Red Sox still must make a move on the 40-man roster to make room for the upstart outfielder. That would mean either pulling off a trade in the next 48 hours or designating someone for assignment.
Farrell said the scenario in which Bradley is not on the roster would be if the team recalls a player who already has been cut or "we look to do something different."
"We've got to work through the roster to get to that point," he said. "That's why it's not a given. It's not an absolute that (Bradley is) in New York. We've got some things to work through. He's done a great job. We've talked about it, and rightfully so, daily. But we're not there to officially announce it."
The Red Sox on Thursday night told non-roster outfielder Ryan Sweeney they were not purchasing his contract. Sweeney can trigger an opt-out clause by midnight Friday, and the Red Sox would have a 48-hour window in which to respond.
"That's what we're working through right now," Farrell said.
He said the door is open for Sweeney if he's willing to start the season in Triple-A Pawtucket. Farrell said he wasn't sure whether general manager Ben Cherington had talked to Sweeney's agent Friday morning.
"We know that in this 24-hour period until midnight tonight, we'll get some response, and after that we will counter accordingly," Farrell said.
Other notes from Farrell's morning meeting with the media:
• He said Carp's ability to provide insurance at first base was the critical element in his making the team. "You could say it was the deciding factor -- the defensive versatility. Not to take anything away from Ryan Sweeney. He's a very good player who can play all three of the outfield positions. We felt like the flexibility to go to first base was a key in this."
• Outfielder Mitch Maier, who has been out with a sprained wrist, can opt out of his minor league deal, but Farrell said it is the team's understanding that he will remain and go to Pawtucket.