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Right-hander Jae Seo is out of the rotation for now, Maddon said. Seo has an 8.10 ERA and allows nearly two baserunners for every inning he pitches.

"Jae will be available in the bullpen," Maddon said. "He may [someday] go back to starting. We're not sure yet."

Right-hander Edwin Jackson, who had been pushed back two extra days coming into Saturday's rainout, will go Monday against the Tigers. Jackson, who is 0-6 with a 7.78 ERA, has been tinkering with his delivery with the help of pitching coach Jim Hickey.

Casey Fossum and James Shields will follow in the rotation -- the rest of which is to be decided, Maddon said.

The rotation is subject to change as well, though Saturday's postponement and Thursday's off day could delay any moves. Jae Seo hasn't given the Rays much reason to think he'll get better, and they seem to be ready to dump him and his $1.2-million salary (first designating him for assignment then possibly releasing him) and call up promising Triple-A prospect Andy Sonnanstine. With Jeff Niemann and Jason Hammel coming, Edwin Jackson and Casey Fossum probably shouldn't be too comfortable.

The bullpen probably won't change much initially, but that may only be because none of the Durham relievers is doing any better. Jon Switzer, however, is on rehab and could be back within a few weeks.