"His arm has just gotten stronger and he's ready to give it another go," Borris said.
Appier, who'll be 38 on Dec. 6, attempted a comeback with the Royals last spring but called it off after pitching in five Cactus League games. When no other club offered him a job, he filed for retirement.
General manager Allard Baird said that the Royals, Appier's original team, are not interested in him as a starting pitcher.
"I don't think he's going to go back to the Royals," Borris said. "Obviously they're in a youth movement and Kevin wants to go where they need a veteran presence."
Appier, a member of the Anaheim Angels' 2002 World Series champions, has also pitched for the Oakland A's and the New York Mets. Other than one outing for the A's in the 2000 playoffs, he has not pitched in relief since 1991.
His career record is 169-137 in 414 games (402 starts) with a 3.74 ERA. He is six strikeouts shy of 2,000.
Charting Graf: Second baseman Tony Graffanino, traded by the Royals on July 19, would draw some interest from his former club.
"Yeah, we would," Baird said. "It just depends on if I'm able to get somebody else sooner than later. If I can fill voids through trades, I might do that."
Borris, who is also Graffanino's agent, expects Boston to make a strong pitch.
"That's a good fit for him over there," Borris said. "He did real well when he finally got there. I think they liked him and he brings a lot to the table."
Graffanino batted .319 after being dealt to the Red Sox for outfielder Chip Ambres and pitcher Juan Cedeno. Before the trade, Graffanino hit .298 for the Royals.
His crucial playoff error aside, he filled the second-base hole so nicely for the Red Sox that they released Mark Bellhorn.
Prime time for Pena: The job of managing the Dominican Republic entry in the World Baseball Classic could be a boon for former Royals manager Tony Pena.
"That's good," Baird said. "I think obviously he still wants to manage and this is high exposure for that. He's going to have some pretty good players on that club, too, so that puts him in a good position."
Among the possible players on the Dominican club are Albert Pujols, Pedro Martinez and David Ortiz.
"He's going to have a good team. It's one of those things, too, where you have a ballclub with so much talent and he's got to put them together quickly. So it will be a lot more challenging than what it looks like on the surface," Baird said.