From FOX Sports:
"Dempster, 31, plans to test the open market, major-league sources say. He filed for free agency on Friday, and does not intend to sign with the Cubs before their exclusive negotiating period with him expires on Nov. 13.
The prevailing assumption in baseball is that the Cubs will re-sign Dempster, a right-hander who went 17-6 with a 2.96 ERA last season while starting full-time for the first time since 2002.
Dempster's return, however, no longer is a given.
While the Cubs remain interested in retaining Dempster, an 11-year veteran, the pitcher first will entertain bids from other clubs. He conceivably could receive four-year offers on the open market, an important consideration if the Cubs only are willing to give him three.