Marco Estrada was moving around better in the Milwaukee Brewers' clubhouse Tuesday, one day after suffering a strained left hamstring.

Well enough to make his next scheduled start Saturday?

Probably not, as it turns out.

"I don't know if this start's going to happen or not," Estrada said. "It doesn't look very good right now. We'll see what happens. I'm not too happy."

Estrada left in the fifth inning of the Brewers' 10-2 loss to the Oakland A's on Monday night at Miller Park and was listed as day to day afterward.

Manager RonRoenicke agreed with Estrada's assessment that he is unlikely to go against the Philadelphia Phillies, which would leave the Brewers needing to announce a replacement on the same day they officially listed reliever AlfredoFigaro as MikeFiers' replacement in the rotation for Friday.

Roenicke said the club already has a plan in place, but that it wouldn't be announced until after Tuesday's game or before Wednesday's game.

There are a few ways the Brewers can go, including calling up someone from the minor leagues such as JohnnyHellweg, JimmyNelson or even ArielPena, the latter two pitching well at Class AA Huntsville.

The team did something similar last year when it brought up TylerThornburg to make a spot start for ShaunMarcum, and Roenicke indicated he's not averse to doing it again.

"I know it didn't work out that well for (Thornburg), but in most cases in most organizations that's what you do," Roenicke said. "You need a spot start from somebody, you go grab somebody who's pitching well in Double-A, Triple-A and bring them up.

"I think it's a great opportunity for a young guy to get that shot and show what he can do, and sometimes you get lucky and that guy goes off and all of a sudden you have a great major-league pitcher.

"I think the more times you can get up here and pitch, the more comfortable you're going to be. And if it's only for one start, the next time you come up you're already going to know what it's about and it's going to be even easier to perform well."

Roenicke said Fiers also could be an option, although Estrada would then need to be placed on the disabled list because Fiers hasn't been in the minor leagues for the required 10 days.

Any way you slice it, the timing isn't great for a Brewers team that already sits in last place in the National League's Central Division and has been struggling to get consistent outings from spots 1-5 in its rotation.

"It's just not a good time right now," Estrada said. "We're hurting with innings by our starters and we're overusing our bullpen, so this obviously doesn't help. I'm not sure what they're going to do."