Since he wouldn't be included in the long trip to Kissimmee, Fla., on Saturday, Roberts, who is dealing with back spasms and hasn't played since Monday, won't be available until at least Sunday.
And that is looking like a serious stretch.
"He is not any better today," Showalter said. "I know they are talking about potentially doing some tests."
Showalter said he doesn't know what tests Roberts might undergo or when -- he should know more later today.
Some more stuff from the session with Showalter:
He made 10 cuts this morning and will make three more around lunchtime. Among those who have been cut and reassigned to minor league camp: catchers Adam Donachie and Caleb Joseph, infielder Pedro Florimon and pitcher Luis Lebron.
Jeremy Guthrie's next start after today will be March 16 in a minor league game against Boston Red Sox farmhands. That way Guthrie will stay on turn and not have to face the Tampa Bay Rays two weeks before he pitches against them for real.
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