It's the same left hip problem that might shut down Floyd for the final two weeks of the season if the White Sox fall deeper into their American League Central hole behind Detroit and Minnesota.
"I don't see any reason to keep throwing that kid out there," said Guillen, when asked about the possibility of Floyd having made his last start of 2009. "But if we continue to lose and we seem like we are not in there, then why should I put this kid in that position?"
Before Guillen is accused of throwing in the towel, with his team sitting 6 1/2 games behind the Tigers and with an elimination number of 11 but with six games to play against Detroit, the White Sox manager explained that the present plan is to skip Floyd in his next start. Either Carlos Torres or Daniel Hudson could take the mound in place of Floyd for Monday's series opener at home against the Twins.
If that missed start and extensive treatment lessen the pain for Floyd and next weekend's games against Detroit have significant meaning, then Guillen remains hopeful Floyd could return.
"I'm not going to take any chance with this kid because this kid has been great for us," Guillen said. "Right now, as of today, hopefully we can skip him one time and give him more rest and hopefully he get better for whatever we got left."
"This has been something I've dealt with for a while," Floyd said. "I don't think it's something severe where it's going to alter me in the long term, but it's definitely been kind of gradually getting. ... It's bearable but it's affecting me a little bit."
In Wednesday's setback, Floyd gave up two runs on three hits to the Mariners in the first inning and then allowed another run in the second. Guillen replaced Floyd with D.J. Carrasco after he pitched a scoreless third, marking Floyd's shortest outing of 2009.
According to Guillen, Floyd was "pushing the ball" against the Mariners, and he didn't like the way Floyd was landing on his pitches. Guillen said that Floyd felt a sharp pain in the same left hip area when he pitched in Anaheim on Friday, although Floyd said it's more of a dull ache.
MRIs have been taken, showing nothing structurally wrong with the hip. Regardless of those results, Guillen will be extremely cautious where a future rotation stalwart is concerned if his remaining two or three starts have no postseason bearing.
"A little time off will get me back on track," Floyd said. "But it was affecting my pitching today. They saw it, and they took me out."
"His MRI shows it's nothing serious, but it has to be something when he feels tightness and pain," Guillen said. "If we skip him, then if it's an important game, hopefully the pain will go away and we'll see what we do."
Scott Merkin is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.