PITTSBURGH -- Sunday was the first day that Reds outfielder Chris Heisey was eligible to come off of the 15-day disabled list. But he was not ready to be activated.

"I can't see it being too much longer," Reds manager Dusty Baker said. "He just started doing baseball activity a couple of days ago."

Heisey has been out with a strained left oblique since Aug. 6. His progress has picked up rapidly since he began throwing and hitting off of a tee on Thursday.

"Yesterday, I shagged fly balls at full speed and felt great," Heisey said. "I've been swinging in the cage. I would have taken [batting practice] on the field if we had it. I think the biggest test now is batting practice on the field and what kind of power I can generate with it. If I can completely let it go, I should be ready here by midweek is my guess."

Heisey hoped to take BP on Tuesday, when the road trip moves to Florida. He is batting .249 with 12 home runs and 38 RBIs in 97 games this season.

"We certainly miss him. We miss his pinch-hitting," Baker said. "We miss his ability to play all outfield positions and play them well and to give Stubby [Drew Stubbs] a day off in center field."

Renteria could return against Marlins

PITTSBURGH -- There was an Edgar Renteria sighting on Saturday, when the injured Reds shortstop appeared as a pinch-hitter in the seventh inning of a 5-3 loss to the Pirates.

Renteria hadn't played since Tuesday, when he suffered a strained left groin while running out a double against the Nationals. In his pinch-hitting appearance, he flied out to center field.

Manager Dusty Baker said that Renteria might return in the Reds' next series, which begins Tuesday in Miami.

"That was a sign he's getting closer," Reds manager Dusty Baker said. "We'll see, maybe in Florida. He had an excellent at-bat. If he reached base, I was going to have Homer [Bailey] run for him."

Worth noting

• Right-hander Logan Ondrusek (strained right forearm) still appears to be on track for activation from the disabled list on Tuesday.

• The Reds will spend Monday's off-day in South Florida before beginning a three-game series against the Marlins at Sun Life Stadium.