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08/19/09 7:50 PM EST

Marlins cautious with N. Johnson injury

First baseman takes grounders, holds off on swinging bat

HOUSTON -- Getting Nick Johnson back into action is a step-by-step process.

Resting a strained right hamstring, the Marlins first baseman did some light workouts in pregame warmups Wednesday at Minute Maid Park.

Johnson did some throwing, and he fielded ground balls at his first base. He was not scheduled to hit.

Could he take some swings on Thursday?

"We'll see how it goes," Johnson said.

Johnson tweaked his hamstring in the first inning of the first game of Sunday's doubleheader against the Rockies at Land Shark Stadium.

As of now, the team isn't considering placing him on the disabled list, but a decision will be made before the Marlins face the Braves in Atlanta on Friday.

"It's little by little," manager Fredi Gonzalez said. "We'll see how it reacts. The good thing is it's getting better and better."

Ross Gload started at first base for the second successive game, hitting in the second spot.

The Marlins are being cautious not to use Johnson if he isn't completely ready. As it stands now, if he goes on the 15-day disabled list, the move could be made retroactive to Monday.

The Marlins have yet to announce their starting pitcher for Friday in Atlanta. There's a good chance it will be right-hander Anibal Sanchez, who is recovering from a right shoulder sprain. Sanchez threw a rehab assignment start for Double-A Jacksonville on Monday.

If Sanchez is called up, the Marlins would have to make a corresponding roster move. One possibility is optioning a player already on the roster. Another is placing Johnson on the disabled list.

Joe Frisaro is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.