After shipping four prospects to the west coast in exchange for four-time All-Star closer Craig Kimbrel, Boston Red Sox president Dave Dombrowski believes most of the trade-related roster moves are done.

"I thought that our acquisition of the relief pitching aspect would more likely come through a trade," Dombrowski told reporters. "We're in a spot that (Kimbrel) is probably our major acquisition for the wintertime as far as the trade market is concerned. You never can tell, but that's what my instincts tell me."

Eager to upgrade a pitching staff that ranked as one of the worst in the majors, Dombrowski will now set his sights on a rich starting pitching free-agent market in hopes of acquiring an ace the likes of David Price, Zack Greinke, or Johnny Cueto.

"My thought process is most likely any acquisition we'd make in the starting pitching would first happen as far as the free agent field is concerned," Dombrowski said. "You never know, but that would be my guess."

Despite packaging top prospects Manuel Margot and Javier Guerra to the San Diego Padres for Kimbrel, the Red Sox still boast a deep farm system, which they could dip into again should they strike out via free agency.

Dombrowski may also have to get creative in finding room in his rotation, as starters Clay Buchholz, Wade Miley, Rick Porcello, Eduardo Rodriguez, Henry Owens, and Joe Kelly are all under contract next season.